41 files changed, 899 insertions, 897 deletions

diff --git a/src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java b/src/main/java/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java
index bdc3a2e..bdc3a2e 100644
--- a/src/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java
+++ b/src/main/java/org/unitConverter/converterGUI/DefaultPrefixRepetitionRule.java
diff --git a/src/org/unitConverter/converterGUI/DelegateListModel.java b/src/main/java/org/unitConverter/converterGUI/DelegateListModel.java
index b80f63d..b80f63d 100644
--- a/src/org/unitConverter/converterGUI/DelegateListModel.java
+++ b/src/main/java/org/unitConverter/converterGUI/DelegateListModel.java
diff --git a/src/org/unitConverter/converterGUI/FilterComparator.java b/src/main/java/org/unitConverter/converterGUI/FilterComparator.java
index 7b17bfc..9b77f21 100644
--- a/src/org/unitConverter/converterGUI/FilterComparator.java
+++ b/src/main/java/org/unitConverter/converterGUI/FilterComparator.java
@@ -1,129 +1,129 @@
-/**

- * Copyright (C) 2018 Adrien Hopkins

- *

- * This program is free software: you can redistribute it and/or modify

- * it under the terms of the GNU Affero General Public License as published by

- * the Free Software Foundation, either version 3 of the License, or

- * (at your option) any later version.

- *

- * This program is distributed in the hope that it will be useful,

- * but WITHOUT ANY WARRANTY; without even the implied warranty of

- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

- * GNU Affero General Public License for more details.

- *

- * You should have received a copy of the GNU Affero General Public License

- * along with this program.  If not, see <https://www.gnu.org/licenses/>.

- */

-package org.unitConverter.converterGUI;

-

-import java.util.Comparator;

-import java.util.Objects;

-

-/**

- * A comparator that compares strings using a filter.

- * 

- * @author Adrien Hopkins

- * @since 2019-01-15

- * @since v0.1.0

- */

-final class FilterComparator implements Comparator<String> {

-	/**

-	 * The filter that the comparator is filtered by.

-	 * 

-	 * @since 2019-01-15

-	 * @since v0.1.0

-	 */

-	private final String filter;

-	/**

-	 * The comparator to use if the arguments are otherwise equal.

-	 * 

-	 * @since 2019-01-15

-	 * @since v0.1.0

-	 */

-	private final Comparator<String> comparator;

-	/**

-	 * Whether or not the comparison is case-sensitive.

-	 * 

-	 * @since 2019-04-14

-	 * @since v0.2.0

-	 */

-	private final boolean caseSensitive;

-

-	/**

-	 * Creates the {@code FilterComparator}.

-	 * 

-	 * @param filter

-	 * @since 2019-01-15

-	 * @since v0.1.0

-	 */

-	public FilterComparator(final String filter) {

-		this(filter, null);

-	}

-

-	/**

-	 * Creates the {@code FilterComparator}.

-	 * 

-	 * @param filter

-	 *            string to filter by

-	 * @param comparator

-	 *            comparator to fall back to if all else fails, null is compareTo.

-	 * @throws NullPointerException

-	 *             if filter is null

-	 * @since 2019-01-15

-	 * @since v0.1.0

-	 */

-	public FilterComparator(final String filter, final Comparator<String> comparator) {

-		this(filter, comparator, false);

-	}

-

-	/**

-	 * Creates the {@code FilterComparator}.

-	 * 

-	 * @param filter

-	 *            string to filter by

-	 * @param comparator

-	 *            comparator to fall back to if all else fails, null is compareTo.

-	 * @param caseSensitive

-	 *            whether or not the comparator is case-sensitive

-	 * @throws NullPointerException

-	 *             if filter is null

-	 * @since 2019-04-14

-	 * @since v0.2.0

-	 */

-	public FilterComparator(final String filter, final Comparator<String> comparator, final boolean caseSensitive) {

-		this.filter = Objects.requireNonNull(filter, "filter must not be null.");

-		this.comparator = comparator;

-		this.caseSensitive = caseSensitive;

-	}

-

-	@Override

-	public int compare(final String arg0, final String arg1) {

-		// if this is case insensitive, make them lowercase

-		final String str0, str1;

-		if (this.caseSensitive) {

-			str0 = arg0;

-			str1 = arg1;

-		} else {

-			str0 = arg0.toLowerCase();

-			str1 = arg1.toLowerCase();

-		}

-

-		// elements that start with the filter always go first

-		if (str0.startsWith(this.filter) && !str1.startsWith(this.filter))

-			return -1;

-		else if (!str0.startsWith(this.filter) && str1.startsWith(this.filter))

-			return 1;

-

-		// elements that contain the filter but don't start with them go next

-		if (str0.contains(this.filter) && !str1.contains(this.filter))

-			return -1;

-		else if (!str0.contains(this.filter) && !str1.contains(this.filter))

-			return 1;

-

-		// other elements go last

-		if (this.comparator == null)

-			return str0.compareTo(str1);

-		else

-			return this.comparator.compare(str0, str1);

-	}

-}

+/**
+ * Copyright (C) 2018 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.util.Comparator;
+import java.util.Objects;
+
+/**
+ * A comparator that compares strings using a filter.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-01-15
+ * @since v0.1.0
+ */
+final class FilterComparator implements Comparator<String> {
+	/**
+	 * The filter that the comparator is filtered by.
+	 * 
+	 * @since 2019-01-15
+	 * @since v0.1.0
+	 */
+	private final String filter;
+	/**
+	 * The comparator to use if the arguments are otherwise equal.
+	 * 
+	 * @since 2019-01-15
+	 * @since v0.1.0
+	 */
+	private final Comparator<String> comparator;
+	/**
+	 * Whether or not the comparison is case-sensitive.
+	 * 
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	private final boolean caseSensitive;
+
+	/**
+	 * Creates the {@code FilterComparator}.
+	 * 
+	 * @param filter
+	 * @since 2019-01-15
+	 * @since v0.1.0
+	 */
+	public FilterComparator(final String filter) {
+		this(filter, null);
+	}
+
+	/**
+	 * Creates the {@code FilterComparator}.
+	 * 
+	 * @param filter
+	 *            string to filter by
+	 * @param comparator
+	 *            comparator to fall back to if all else fails, null is compareTo.
+	 * @throws NullPointerException
+	 *             if filter is null
+	 * @since 2019-01-15
+	 * @since v0.1.0
+	 */
+	public FilterComparator(final String filter, final Comparator<String> comparator) {
+		this(filter, comparator, false);
+	}
+
+	/**
+	 * Creates the {@code FilterComparator}.
+	 * 
+	 * @param filter
+	 *            string to filter by
+	 * @param comparator
+	 *            comparator to fall back to if all else fails, null is compareTo.
+	 * @param caseSensitive
+	 *            whether or not the comparator is case-sensitive
+	 * @throws NullPointerException
+	 *             if filter is null
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	public FilterComparator(final String filter, final Comparator<String> comparator, final boolean caseSensitive) {
+		this.filter = Objects.requireNonNull(filter, "filter must not be null.");
+		this.comparator = comparator;
+		this.caseSensitive = caseSensitive;
+	}
+
+	@Override
+	public int compare(final String arg0, final String arg1) {
+		// if this is case insensitive, make them lowercase
+		final String str0, str1;
+		if (this.caseSensitive) {
+			str0 = arg0;
+			str1 = arg1;
+		} else {
+			str0 = arg0.toLowerCase();
+			str1 = arg1.toLowerCase();
+		}
+
+		// elements that start with the filter always go first
+		if (str0.startsWith(this.filter) && !str1.startsWith(this.filter))
+			return -1;
+		else if (!str0.startsWith(this.filter) && str1.startsWith(this.filter))
+			return 1;
+
+		// elements that contain the filter but don't start with them go next
+		if (str0.contains(this.filter) && !str1.contains(this.filter))
+			return -1;
+		else if (!str0.contains(this.filter) && !str1.contains(this.filter))
+			return 1;
+
+		// other elements go last
+		if (this.comparator == null)
+			return str0.compareTo(str1);
+		else
+			return this.comparator.compare(str0, str1);
+	}
+}
diff --git a/src/org/unitConverter/converterGUI/GridBagBuilder.java b/src/main/java/org/unitConverter/converterGUI/GridBagBuilder.java
index f1229b2..f1229b2 100644
--- a/src/org/unitConverter/converterGUI/GridBagBuilder.java
+++ b/src/main/java/org/unitConverter/converterGUI/GridBagBuilder.java
diff --git a/src/org/unitConverter/converterGUI/MutablePredicate.java b/src/main/java/org/unitConverter/converterGUI/MutablePredicate.java
index e15b3cd..e15b3cd 100644
--- a/src/org/unitConverter/converterGUI/MutablePredicate.java
+++ b/src/main/java/org/unitConverter/converterGUI/MutablePredicate.java
diff --git a/src/org/unitConverter/converterGUI/SearchBoxList.java b/src/main/java/org/unitConverter/converterGUI/SearchBoxList.java
index 10ef589..10ef589 100644
--- a/src/org/unitConverter/converterGUI/SearchBoxList.java
+++ b/src/main/java/org/unitConverter/converterGUI/SearchBoxList.java
diff --git a/src/org/unitConverter/converterGUI/UnitConverterGUI.java b/src/main/java/org/unitConverter/converterGUI/UnitConverterGUI.java
index 6ddc4a0..c046846 100644
--- a/src/org/unitConverter/converterGUI/UnitConverterGUI.java
+++ b/src/main/java/org/unitConverter/converterGUI/UnitConverterGUI.java
@@ -1141,12 +1141,14 @@ final class UnitConverterGUI {
 					// get info text
 					final String infoText;
 					try {
-						final Path aboutFile = Path.of("src", "about.txt");
+						final Path aboutFile = Path.of("src", "main", "resources",
+								"about.txt");
 						infoText = Files.readAllLines(aboutFile).stream()
 								.map(Presenter::withoutComments)
 								.collect(Collectors.joining("\n"));
 					} catch (final IOException e) {
-						throw new AssertionError("I/O exception loading about.txt");
+						throw new AssertionError("I/O exception loading about.txt",
+								e);
 					}
 					infoTextArea.setText(infoText);
 				}
diff --git a/src/org/unitConverter/converterGUI/package-info.java b/src/main/java/org/unitConverter/converterGUI/package-info.java
index d85ecab..d85ecab 100644
--- a/src/org/unitConverter/converterGUI/package-info.java
+++ b/src/main/java/org/unitConverter/converterGUI/package-info.java
diff --git a/src/org/unitConverter/math/ConditionalExistenceCollections.java b/src/main/java/org/unitConverter/math/ConditionalExistenceCollections.java
index ac1c0cf..ac1c0cf 100644
--- a/src/org/unitConverter/math/ConditionalExistenceCollections.java
+++ b/src/main/java/org/unitConverter/math/ConditionalExistenceCollections.java
diff --git a/src/org/unitConverter/math/DecimalComparison.java b/src/main/java/org/unitConverter/math/DecimalComparison.java
index 0f5b91e..0f5b91e 100644
--- a/src/org/unitConverter/math/DecimalComparison.java
+++ b/src/main/java/org/unitConverter/math/DecimalComparison.java
diff --git a/src/org/unitConverter/math/ExpressionParser.java b/src/main/java/org/unitConverter/math/ExpressionParser.java
index 8a0e97d..8a0e97d 100644
--- a/src/org/unitConverter/math/ExpressionParser.java
+++ b/src/main/java/org/unitConverter/math/ExpressionParser.java
diff --git a/src/org/unitConverter/math/ObjectProduct.java b/src/main/java/org/unitConverter/math/ObjectProduct.java
index bf00647..5217d93 100644
--- a/src/org/unitConverter/math/ObjectProduct.java
+++ b/src/main/java/org/unitConverter/math/ObjectProduct.java
@@ -1,284 +1,284 @@
-/**

- * Copyright (C) 2018 Adrien Hopkins

- *

- * This program is free software: you can redistribute it and/or modify

- * it under the terms of the GNU Affero General Public License as published by

- * the Free Software Foundation, either version 3 of the License, or

- * (at your option) any later version.

- *

- * This program is distributed in the hope that it will be useful,

- * but WITHOUT ANY WARRANTY; without even the implied warranty of

- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

- * GNU Affero General Public License for more details.

- *

- * You should have received a copy of the GNU Affero General Public License

- * along with this program.  If not, see <https://www.gnu.org/licenses/>.

- */

-package org.unitConverter.math;

-

-import java.util.ArrayList;

-import java.util.Collections;

-import java.util.HashMap;

-import java.util.HashSet;

-import java.util.List;

-import java.util.Map;

-import java.util.Objects;

-import java.util.Set;

-import java.util.function.Function;

-

-/**

- * An immutable product of multiple objects of a type, such as base units. The objects can be multiplied and

- * exponentiated.

- * 

- * @author Adrien Hopkins

- * @since 2019-10-16

- */

-public final class ObjectProduct<T> {

-	/**

-	 * Returns an empty ObjectProduct of a certain type

-	 * 

-	 * @param <T>

-	 *            type of objects that can be multiplied

-	 * @return empty product

-	 * @since 2019-10-16

-	 */

-	public static final <T> ObjectProduct<T> empty() {

-		return new ObjectProduct<>(new HashMap<>());

-	}

-

-	/**

-	 * Gets an {@code ObjectProduct} from an object-to-integer mapping

-	 * 

-	 * @param <T>

-	 *            type of object in product

-	 * @param map

-	 *            map mapping objects to exponents

-	 * @return object product

-	 * @since 2019-10-16

-	 */

-	public static final <T> ObjectProduct<T> fromExponentMapping(final Map<T, Integer> map) {

-		return new ObjectProduct<>(new HashMap<>(map));

-	}

-

-	/**

-	 * Gets an ObjectProduct that has one of the inputted argument, and nothing else.

-	 * 

-	 * @param object

-	 *            object that will be in the product

-	 * @return product

-	 * @since 2019-10-16

-	 * @throws NullPointerException

-	 *             if object is null

-	 */

-	public static final <T> ObjectProduct<T> oneOf(final T object) {

-		Objects.requireNonNull(object, "object must not be null.");

-		final Map<T, Integer> map = new HashMap<>();

-		map.put(object, 1);

-		return new ObjectProduct<>(map);

-	}

-

-	/**

-	 * The objects that make up the product, mapped to their exponents. This map treats zero as null, and is immutable.

-	 * 

-	 * @since 2019-10-16

-	 */

-	final Map<T, Integer> exponents;

-

-	/**

-	 * Creates the {@code ObjectProduct}.

-	 * 

-	 * @param exponents

-	 *            objects that make up this product

-	 * @since 2019-10-16

-	 */

-	private ObjectProduct(final Map<T, Integer> exponents) {

-		this.exponents = Collections.unmodifiableMap(ConditionalExistenceCollections.conditionalExistenceMap(exponents,

-				e -> !Integer.valueOf(0).equals(e.getValue())));

-	}

-

-	/**

-	 * Calculates the quotient of two products

-	 *

-	 * @param other

-	 *            other product

-	 * @return quotient of two products

-	 * @since 2019-10-16

-	 * @throws NullPointerException

-	 *             if other is null

-	 */

-	public ObjectProduct<T> dividedBy(final ObjectProduct<T> other) {

-		Objects.requireNonNull(other, "other must not be null.");

-		// get a list of all objects in both sets

-		final Set<T> objects = new HashSet<>();

-		objects.addAll(this.getBaseSet());

-		objects.addAll(other.getBaseSet());

-

-		// get a list of all exponents

-		final Map<T, Integer> map = new HashMap<>(objects.size());

-		for (final T key : objects) {

-			map.put(key, this.getExponent(key) - other.getExponent(key));

-		}

-

-		// create the product

-		return new ObjectProduct<>(map);

-	}

-

-	// this method relies on the use of ZeroIsNullMap

-	@Override

-	public boolean equals(final Object obj) {

-		if (this == obj)

-			return true;

-		if (!(obj instanceof ObjectProduct))

-			return false;

-		final ObjectProduct<?> other = (ObjectProduct<?>) obj;

-		return Objects.equals(this.exponents, other.exponents);

-	}

-

-	/**

-	 * @return immutable map mapping objects to exponents

-	 * @since 2019-10-16

-	 */

-	public Map<T, Integer> exponentMap() {

-		return this.exponents;

-	}

-

-	/**

-	 * @return a set of all of the base objects with non-zero exponents that make up this dimension.

-	 * @since 2018-12-12

-	 * @since v0.1.0

-	 */

-	public final Set<T> getBaseSet() {

-		final Set<T> dimensions = new HashSet<>();

-

-		// add all dimensions with a nonzero exponent - zero exponents shouldn't be there in the first place

-		for (final T dimension : this.exponents.keySet()) {

-			if (!this.exponents.get(dimension).equals(0)) {

-				dimensions.add(dimension);

-			}

-		}

-

-		return dimensions;

-	}

-

-	/**

-	 * Gets the exponent for a specific dimension.

-	 * 

-	 * @param dimension

-	 *            dimension to check

-	 * @return exponent for that dimension

-	 * @since 2018-12-12

-	 * @since v0.1.0

-	 */

-	public int getExponent(final T dimension) {

-		return this.exponents.getOrDefault(dimension, 0);

-	}

-

-	@Override

-	public int hashCode() {

-		return Objects.hash(this.exponents);

-	}

-

-	/**

-	 * @return true if this product is a single object, i.e. it has one exponent of one and no other nonzero exponents

-	 * @since 2019-10-16

-	 */

-	public boolean isSingleObject() {

-		int oneCount = 0;

-		boolean twoOrMore = false; // has exponents of 2 or more

-		for (final T b : this.getBaseSet()) {

-			if (this.getExponent(b) == 1) {

-				oneCount++;

-			} else if (this.getExponent(b) != 0) {

-				twoOrMore = true;

-			}

-		}

-		return oneCount == 1 && !twoOrMore;

-	}

-

-	/**

-	 * Multiplies this product by another

-	 *

-	 * @param other

-	 *            other product

-	 * @return product of two products

-	 * @since 2019-10-16

-	 * @throws NullPointerException

-	 *             if other is null

-	 */

-	public ObjectProduct<T> times(final ObjectProduct<T> other) {

-		Objects.requireNonNull(other, "other must not be null.");

-		// get a list of all objects in both sets

-		final Set<T> objects = new HashSet<>();

-		objects.addAll(this.getBaseSet());

-		objects.addAll(other.getBaseSet());

-

-		// get a list of all exponents

-		final Map<T, Integer> map = new HashMap<>(objects.size());

-		for (final T key : objects) {

-			map.put(key, this.getExponent(key) + other.getExponent(key));

-		}

-

-		// create the product

-		return new ObjectProduct<>(map);

-	}

-

-	/**

-	 * Returns this product, but to an exponent

-	 * 

-	 * @param exponent

-	 *            exponent

-	 * @return result of exponentiation

-	 * @since 2019-10-16

-	 */

-	public ObjectProduct<T> toExponent(final int exponent) {

-		final Map<T, Integer> map = new HashMap<>(this.exponents);

-		for (final T key : this.exponents.keySet()) {

-			map.put(key, this.getExponent(key) * exponent);

-		}

-		return new ObjectProduct<>(map);

-	}

-

-	/**

-	 * Converts this product to a string using the objects' {@link Object#toString()} method. If objects have a long

-	 * toString representation, it is recommended to use {@link #toString(Function)} instead to shorten the returned

-	 * string.

-	 * 

-	 * <p>

-	 * {@inheritDoc}

-	 */

-	@Override

-	public String toString() {

-		return this.toString(Object::toString);

-	}

-

-	/**

-	 * Converts this product to a string. The objects that make up this product are represented by

-	 * {@code objectToString}

-	 * 

-	 * @param objectToString

-	 *            function to convert objects to strings

-	 * @return string representation of product

-	 * @since 2019-10-16

-	 */

-	public String toString(final Function<T, String> objectToString) {

-		final List<String> positiveStringComponents = new ArrayList<>();

-		final List<String> negativeStringComponents = new ArrayList<>();

-

-		// for each base object that makes up this object, add it and its exponent

-		for (final T object : this.getBaseSet()) {

-			final int exponent = this.exponents.get(object);

-			if (exponent > 0) {

-				positiveStringComponents.add(String.format("%s^%d", objectToString.apply(object), exponent));

-			} else if (exponent < 0) {

-				negativeStringComponents.add(String.format("%s^%d", objectToString.apply(object), -exponent));

-			}

-		}

-

-		final String positiveString = positiveStringComponents.isEmpty() ? "1"

-				: String.join(" * ", positiveStringComponents);

-		final String negativeString = negativeStringComponents.isEmpty() ? ""

-				: " / " + String.join(" * ", negativeStringComponents);

-

-		return positiveString + negativeString;

-	}

-}

+/**
+ * Copyright (C) 2018 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.math;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Function;
+
+/**
+ * An immutable product of multiple objects of a type, such as base units. The objects can be multiplied and
+ * exponentiated.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-10-16
+ */
+public final class ObjectProduct<T> {
+	/**
+	 * Returns an empty ObjectProduct of a certain type
+	 * 
+	 * @param <T>
+	 *            type of objects that can be multiplied
+	 * @return empty product
+	 * @since 2019-10-16
+	 */
+	public static final <T> ObjectProduct<T> empty() {
+		return new ObjectProduct<>(new HashMap<>());
+	}
+
+	/**
+	 * Gets an {@code ObjectProduct} from an object-to-integer mapping
+	 * 
+	 * @param <T>
+	 *            type of object in product
+	 * @param map
+	 *            map mapping objects to exponents
+	 * @return object product
+	 * @since 2019-10-16
+	 */
+	public static final <T> ObjectProduct<T> fromExponentMapping(final Map<T, Integer> map) {
+		return new ObjectProduct<>(new HashMap<>(map));
+	}
+
+	/**
+	 * Gets an ObjectProduct that has one of the inputted argument, and nothing else.
+	 * 
+	 * @param object
+	 *            object that will be in the product
+	 * @return product
+	 * @since 2019-10-16
+	 * @throws NullPointerException
+	 *             if object is null
+	 */
+	public static final <T> ObjectProduct<T> oneOf(final T object) {
+		Objects.requireNonNull(object, "object must not be null.");
+		final Map<T, Integer> map = new HashMap<>();
+		map.put(object, 1);
+		return new ObjectProduct<>(map);
+	}
+
+	/**
+	 * The objects that make up the product, mapped to their exponents. This map treats zero as null, and is immutable.
+	 * 
+	 * @since 2019-10-16
+	 */
+	final Map<T, Integer> exponents;
+
+	/**
+	 * Creates the {@code ObjectProduct}.
+	 * 
+	 * @param exponents
+	 *            objects that make up this product
+	 * @since 2019-10-16
+	 */
+	private ObjectProduct(final Map<T, Integer> exponents) {
+		this.exponents = Collections.unmodifiableMap(ConditionalExistenceCollections.conditionalExistenceMap(exponents,
+				e -> !Integer.valueOf(0).equals(e.getValue())));
+	}
+
+	/**
+	 * Calculates the quotient of two products
+	 *
+	 * @param other
+	 *            other product
+	 * @return quotient of two products
+	 * @since 2019-10-16
+	 * @throws NullPointerException
+	 *             if other is null
+	 */
+	public ObjectProduct<T> dividedBy(final ObjectProduct<T> other) {
+		Objects.requireNonNull(other, "other must not be null.");
+		// get a list of all objects in both sets
+		final Set<T> objects = new HashSet<>();
+		objects.addAll(this.getBaseSet());
+		objects.addAll(other.getBaseSet());
+
+		// get a list of all exponents
+		final Map<T, Integer> map = new HashMap<>(objects.size());
+		for (final T key : objects) {
+			map.put(key, this.getExponent(key) - other.getExponent(key));
+		}
+
+		// create the product
+		return new ObjectProduct<>(map);
+	}
+
+	// this method relies on the use of ZeroIsNullMap
+	@Override
+	public boolean equals(final Object obj) {
+		if (this == obj)
+			return true;
+		if (!(obj instanceof ObjectProduct))
+			return false;
+		final ObjectProduct<?> other = (ObjectProduct<?>) obj;
+		return Objects.equals(this.exponents, other.exponents);
+	}
+
+	/**
+	 * @return immutable map mapping objects to exponents
+	 * @since 2019-10-16
+	 */
+	public Map<T, Integer> exponentMap() {
+		return this.exponents;
+	}
+
+	/**
+	 * @return a set of all of the base objects with non-zero exponents that make up this dimension.
+	 * @since 2018-12-12
+	 * @since v0.1.0
+	 */
+	public final Set<T> getBaseSet() {
+		final Set<T> dimensions = new HashSet<>();
+
+		// add all dimensions with a nonzero exponent - zero exponents shouldn't be there in the first place
+		for (final T dimension : this.exponents.keySet()) {
+			if (!this.exponents.get(dimension).equals(0)) {
+				dimensions.add(dimension);
+			}
+		}
+
+		return dimensions;
+	}
+
+	/**
+	 * Gets the exponent for a specific dimension.
+	 * 
+	 * @param dimension
+	 *            dimension to check
+	 * @return exponent for that dimension
+	 * @since 2018-12-12
+	 * @since v0.1.0
+	 */
+	public int getExponent(final T dimension) {
+		return this.exponents.getOrDefault(dimension, 0);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.exponents);
+	}
+
+	/**
+	 * @return true if this product is a single object, i.e. it has one exponent of one and no other nonzero exponents
+	 * @since 2019-10-16
+	 */
+	public boolean isSingleObject() {
+		int oneCount = 0;
+		boolean twoOrMore = false; // has exponents of 2 or more
+		for (final T b : this.getBaseSet()) {
+			if (this.getExponent(b) == 1) {
+				oneCount++;
+			} else if (this.getExponent(b) != 0) {
+				twoOrMore = true;
+			}
+		}
+		return oneCount == 1 && !twoOrMore;
+	}
+
+	/**
+	 * Multiplies this product by another
+	 *
+	 * @param other
+	 *            other product
+	 * @return product of two products
+	 * @since 2019-10-16
+	 * @throws NullPointerException
+	 *             if other is null
+	 */
+	public ObjectProduct<T> times(final ObjectProduct<T> other) {
+		Objects.requireNonNull(other, "other must not be null.");
+		// get a list of all objects in both sets
+		final Set<T> objects = new HashSet<>();
+		objects.addAll(this.getBaseSet());
+		objects.addAll(other.getBaseSet());
+
+		// get a list of all exponents
+		final Map<T, Integer> map = new HashMap<>(objects.size());
+		for (final T key : objects) {
+			map.put(key, this.getExponent(key) + other.getExponent(key));
+		}
+
+		// create the product
+		return new ObjectProduct<>(map);
+	}
+
+	/**
+	 * Returns this product, but to an exponent
+	 * 
+	 * @param exponent
+	 *            exponent
+	 * @return result of exponentiation
+	 * @since 2019-10-16
+	 */
+	public ObjectProduct<T> toExponent(final int exponent) {
+		final Map<T, Integer> map = new HashMap<>(this.exponents);
+		for (final T key : this.exponents.keySet()) {
+			map.put(key, this.getExponent(key) * exponent);
+		}
+		return new ObjectProduct<>(map);
+	}
+
+	/**
+	 * Converts this product to a string using the objects' {@link Object#toString()} method. If objects have a long
+	 * toString representation, it is recommended to use {@link #toString(Function)} instead to shorten the returned
+	 * string.
+	 * 
+	 * <p>
+	 * {@inheritDoc}
+	 */
+	@Override
+	public String toString() {
+		return this.toString(Object::toString);
+	}
+
+	/**
+	 * Converts this product to a string. The objects that make up this product are represented by
+	 * {@code objectToString}
+	 * 
+	 * @param objectToString
+	 *            function to convert objects to strings
+	 * @return string representation of product
+	 * @since 2019-10-16
+	 */
+	public String toString(final Function<T, String> objectToString) {
+		final List<String> positiveStringComponents = new ArrayList<>();
+		final List<String> negativeStringComponents = new ArrayList<>();
+
+		// for each base object that makes up this object, add it and its exponent
+		for (final T object : this.getBaseSet()) {
+			final int exponent = this.exponents.get(object);
+			if (exponent > 0) {
+				positiveStringComponents.add(String.format("%s^%d", objectToString.apply(object), exponent));
+			} else if (exponent < 0) {
+				negativeStringComponents.add(String.format("%s^%d", objectToString.apply(object), -exponent));
+			}
+		}
+
+		final String positiveString = positiveStringComponents.isEmpty() ? "1"
+				: String.join(" * ", positiveStringComponents);
+		final String negativeString = negativeStringComponents.isEmpty() ? ""
+				: " / " + String.join(" * ", negativeStringComponents);
+
+		return positiveString + negativeString;
+	}
+}
diff --git a/src/org/unitConverter/math/UncertainDouble.java b/src/main/java/org/unitConverter/math/UncertainDouble.java
index 3651bd5..3651bd5 100644
--- a/src/org/unitConverter/math/UncertainDouble.java
+++ b/src/main/java/org/unitConverter/math/UncertainDouble.java
diff --git a/src/org/unitConverter/math/package-info.java b/src/main/java/org/unitConverter/math/package-info.java
index 65727e4..65727e4 100644
--- a/src/org/unitConverter/math/package-info.java
+++ b/src/main/java/org/unitConverter/math/package-info.java
diff --git a/src/org/unitConverter/package-info.java b/src/main/java/org/unitConverter/package-info.java
index 23dd165..23dd165 100644
--- a/src/org/unitConverter/package-info.java
+++ b/src/main/java/org/unitConverter/package-info.java
diff --git a/src/org/unitConverter/unit/BaseDimension.java b/src/main/java/org/unitConverter/unit/BaseDimension.java
index 8e63a17..8e63a17 100644
--- a/src/org/unitConverter/unit/BaseDimension.java
+++ b/src/main/java/org/unitConverter/unit/BaseDimension.java
diff --git a/src/org/unitConverter/unit/BaseUnit.java b/src/main/java/org/unitConverter/unit/BaseUnit.java
index 6757bd0..6757bd0 100644
--- a/src/org/unitConverter/unit/BaseUnit.java
+++ b/src/main/java/org/unitConverter/unit/BaseUnit.java
diff --git a/src/org/unitConverter/unit/BritishImperial.java b/src/main/java/org/unitConverter/unit/BritishImperial.java
index ea23cd1..ea23cd1 100644
--- a/src/org/unitConverter/unit/BritishImperial.java
+++ b/src/main/java/org/unitConverter/unit/BritishImperial.java
diff --git a/src/org/unitConverter/unit/FunctionalUnit.java b/src/main/java/org/unitConverter/unit/FunctionalUnit.java
index 586e0d7..586e0d7 100644
--- a/src/org/unitConverter/unit/FunctionalUnit.java
+++ b/src/main/java/org/unitConverter/unit/FunctionalUnit.java
diff --git a/src/org/unitConverter/unit/FunctionalUnitlike.java b/src/main/java/org/unitConverter/unit/FunctionalUnitlike.java
index 21c1fca..21c1fca 100644
--- a/src/org/unitConverter/unit/FunctionalUnitlike.java
+++ b/src/main/java/org/unitConverter/unit/FunctionalUnitlike.java
diff --git a/src/org/unitConverter/unit/LinearUnit.java b/src/main/java/org/unitConverter/unit/LinearUnit.java
index b7f33d5..b7f33d5 100644
--- a/src/org/unitConverter/unit/LinearUnit.java
+++ b/src/main/java/org/unitConverter/unit/LinearUnit.java
diff --git a/src/org/unitConverter/unit/LinearUnitValue.java b/src/main/java/org/unitConverter/unit/LinearUnitValue.java
index 8de734e..8de734e 100644
--- a/src/org/unitConverter/unit/LinearUnitValue.java
+++ b/src/main/java/org/unitConverter/unit/LinearUnitValue.java
diff --git a/src/org/unitConverter/unit/MultiUnit.java b/src/main/java/org/unitConverter/unit/MultiUnit.java
index a1623f8..a1623f8 100644
--- a/src/org/unitConverter/unit/MultiUnit.java
+++ b/src/main/java/org/unitConverter/unit/MultiUnit.java
diff --git a/src/org/unitConverter/unit/NameSymbol.java b/src/main/java/org/unitConverter/unit/NameSymbol.java
index 8d8302a..8d8302a 100644
--- a/src/org/unitConverter/unit/NameSymbol.java
+++ b/src/main/java/org/unitConverter/unit/NameSymbol.java
diff --git a/src/org/unitConverter/unit/Nameable.java b/src/main/java/org/unitConverter/unit/Nameable.java
index 36740ab..36740ab 100644
--- a/src/org/unitConverter/unit/Nameable.java
+++ b/src/main/java/org/unitConverter/unit/Nameable.java
diff --git a/src/org/unitConverter/unit/SI.java b/src/main/java/org/unitConverter/unit/SI.java
index c88d2bc..81736f3 100644
--- a/src/org/unitConverter/unit/SI.java
+++ b/src/main/java/org/unitConverter/unit/SI.java
@@ -1,479 +1,479 @@
-/**

- * Copyright (C) 2018 Adrien Hopkins

- *

- * This program is free software: you can redistribute it and/or modify

- * it under the terms of the GNU Affero General Public License as published by

- * the Free Software Foundation, either version 3 of the License, or

- * (at your option) any later version.

- *

- * This program is distributed in the hope that it will be useful,

- * but WITHOUT ANY WARRANTY; without even the implied warranty of

- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

- * GNU Affero General Public License for more details.

- *

- * You should have received a copy of the GNU Affero General Public License

- * along with this program.  If not, see <https://www.gnu.org/licenses/>.

- */

-package org.unitConverter.unit;

-

-import java.util.Set;

-

-import org.unitConverter.math.ObjectProduct;

-

-/**

- * All of the units, prefixes and dimensions that are used by the SI, as well as

- * some outside the SI.

- * 

- * <p>

- * This class does not include prefixed units. To obtain prefixed units, use

- * {@link LinearUnit#withPrefix}:

- * 

- * <pre>

- * LinearUnit KILOMETRE = SI.METRE.withPrefix(SI.KILO);

- * </pre>

- * 

- * 

- * @author Adrien Hopkins

- * @since 2019-10-16

- */

-public final class SI {

-	/// dimensions used by SI units

-	// base dimensions, as BaseDimensions

-	public static final class BaseDimensions {

-		public static final BaseDimension LENGTH = BaseDimension.valueOf("Length",

-				"L");

-		public static final BaseDimension MASS = BaseDimension.valueOf("Mass",

-				"M");

-		public static final BaseDimension TIME = BaseDimension.valueOf("Time",

-				"T");

-		public static final BaseDimension ELECTRIC_CURRENT = BaseDimension

-				.valueOf("Electric Current", "I");

-		public static final BaseDimension TEMPERATURE = BaseDimension

-				.valueOf("Temperature", "\u0398"); // theta symbol

-		public static final BaseDimension QUANTITY = BaseDimension

-				.valueOf("Quantity", "N");

-		public static final BaseDimension LUMINOUS_INTENSITY = BaseDimension

-				.valueOf("Luminous Intensity", "J");

-		public static final BaseDimension INFORMATION = BaseDimension

-				.valueOf("Information", "Info"); // non-SI

-		public static final BaseDimension CURRENCY = BaseDimension

-				.valueOf("Currency", "$$"); // non-SI

-		

-		// You may NOT get SI.BaseDimensions instances!

-		private BaseDimensions() {

-			throw new AssertionError();

-		}

-	}

-	

-	/// base units of the SI

-	// suppressing warnings since these are the same object, but in a different

-	/// form (class)

-	@SuppressWarnings("hiding")

-	public static final class BaseUnits {

-		public static final BaseUnit METRE = BaseUnit

-				.valueOf(BaseDimensions.LENGTH, "metre", "m");

-		public static final BaseUnit KILOGRAM = BaseUnit

-				.valueOf(BaseDimensions.MASS, "kilogram", "kg");

-		public static final BaseUnit SECOND = BaseUnit

-				.valueOf(BaseDimensions.TIME, "second", "s");

-		public static final BaseUnit AMPERE = BaseUnit

-				.valueOf(BaseDimensions.ELECTRIC_CURRENT, "ampere", "A");

-		public static final BaseUnit KELVIN = BaseUnit

-				.valueOf(BaseDimensions.TEMPERATURE, "kelvin", "K");

-		public static final BaseUnit MOLE = BaseUnit

-				.valueOf(BaseDimensions.QUANTITY, "mole", "mol");

-		public static final BaseUnit CANDELA = BaseUnit

-				.valueOf(BaseDimensions.LUMINOUS_INTENSITY, "candela", "cd");

-		public static final BaseUnit BIT = BaseUnit

-				.valueOf(BaseDimensions.INFORMATION, "bit", "b");

-		public static final BaseUnit DOLLAR = BaseUnit

-				.valueOf(BaseDimensions.CURRENCY, "dollar", "$");

-		

-		public static final Set<BaseUnit> BASE_UNITS = Set.of(METRE, KILOGRAM,

-				SECOND, AMPERE, KELVIN, MOLE, CANDELA, BIT);

-		

-		// You may NOT get SI.BaseUnits instances!

-		private BaseUnits() {

-			throw new AssertionError();

-		}

-	}

-	

-	/**

-	 * Constants that relate to the SI or other systems.

-	 * 

-	 * @author Adrien Hopkins

-	 * @since 2019-11-08

-	 */

-	public static final class Constants {

-		public static final LinearUnit EARTH_GRAVITY = METRE.dividedBy(SECOND)

-				.dividedBy(SECOND).times(9.80665);

-	}

-	

-	// dimensions used in the SI, as ObjectProducts

-	public static final class Dimensions {

-		public static final ObjectProduct<BaseDimension> EMPTY = ObjectProduct

-				.empty();

-		public static final ObjectProduct<BaseDimension> LENGTH = ObjectProduct

-				.oneOf(BaseDimensions.LENGTH);

-		public static final ObjectProduct<BaseDimension> MASS = ObjectProduct

-				.oneOf(BaseDimensions.MASS);

-		public static final ObjectProduct<BaseDimension> TIME = ObjectProduct

-				.oneOf(BaseDimensions.TIME);

-		public static final ObjectProduct<BaseDimension> ELECTRIC_CURRENT = ObjectProduct

-				.oneOf(BaseDimensions.ELECTRIC_CURRENT);

-		public static final ObjectProduct<BaseDimension> TEMPERATURE = ObjectProduct

-				.oneOf(BaseDimensions.TEMPERATURE);

-		public static final ObjectProduct<BaseDimension> QUANTITY = ObjectProduct

-				.oneOf(BaseDimensions.QUANTITY);

-		public static final ObjectProduct<BaseDimension> LUMINOUS_INTENSITY = ObjectProduct

-				.oneOf(BaseDimensions.LUMINOUS_INTENSITY);

-		public static final ObjectProduct<BaseDimension> INFORMATION = ObjectProduct

-				.oneOf(BaseDimensions.INFORMATION);

-		public static final ObjectProduct<BaseDimension> CURRENCY = ObjectProduct

-				.oneOf(BaseDimensions.CURRENCY);

-		

-		// derived dimensions without named SI units

-		public static final ObjectProduct<BaseDimension> AREA = LENGTH

-				.times(LENGTH);

-		public static final ObjectProduct<BaseDimension> VOLUME = AREA

-				.times(LENGTH);

-		public static final ObjectProduct<BaseDimension> VELOCITY = LENGTH

-				.dividedBy(TIME);

-		public static final ObjectProduct<BaseDimension> ACCELERATION = VELOCITY

-				.dividedBy(TIME);

-		public static final ObjectProduct<BaseDimension> WAVENUMBER = EMPTY

-				.dividedBy(LENGTH);

-		public static final ObjectProduct<BaseDimension> MASS_DENSITY = MASS

-				.dividedBy(VOLUME);

-		public static final ObjectProduct<BaseDimension> SURFACE_DENSITY = MASS

-				.dividedBy(AREA);

-		public static final ObjectProduct<BaseDimension> SPECIFIC_VOLUME = VOLUME

-				.dividedBy(MASS);

-		public static final ObjectProduct<BaseDimension> CURRENT_DENSITY = ELECTRIC_CURRENT

-				.dividedBy(AREA);

-		public static final ObjectProduct<BaseDimension> MAGNETIC_FIELD_STRENGTH = ELECTRIC_CURRENT

-				.dividedBy(LENGTH);

-		public static final ObjectProduct<BaseDimension> CONCENTRATION = QUANTITY

-				.dividedBy(VOLUME);

-		public static final ObjectProduct<BaseDimension> MASS_CONCENTRATION = CONCENTRATION

-				.times(MASS);

-		public static final ObjectProduct<BaseDimension> LUMINANCE = LUMINOUS_INTENSITY

-				.dividedBy(AREA);

-		public static final ObjectProduct<BaseDimension> REFRACTIVE_INDEX = VELOCITY

-				.dividedBy(VELOCITY);

-		public static final ObjectProduct<BaseDimension> REFRACTIVE_PERMEABILITY = EMPTY

-				.times(EMPTY);

-		public static final ObjectProduct<BaseDimension> ANGLE = LENGTH

-				.dividedBy(LENGTH);

-		public static final ObjectProduct<BaseDimension> SOLID_ANGLE = AREA

-				.dividedBy(AREA);

-		

-		// derived dimensions with named SI units

-		public static final ObjectProduct<BaseDimension> FREQUENCY = EMPTY

-				.dividedBy(TIME);

-		public static final ObjectProduct<BaseDimension> FORCE = MASS

-				.times(ACCELERATION);

-		public static final ObjectProduct<BaseDimension> ENERGY = FORCE

-				.times(LENGTH);

-		public static final ObjectProduct<BaseDimension> POWER = ENERGY

-				.dividedBy(TIME);

-		public static final ObjectProduct<BaseDimension> ELECTRIC_CHARGE = ELECTRIC_CURRENT

-				.times(TIME);

-		public static final ObjectProduct<BaseDimension> VOLTAGE = ENERGY

-				.dividedBy(ELECTRIC_CHARGE);

-		public static final ObjectProduct<BaseDimension> CAPACITANCE = ELECTRIC_CHARGE

-				.dividedBy(VOLTAGE);

-		public static final ObjectProduct<BaseDimension> ELECTRIC_RESISTANCE = VOLTAGE

-				.dividedBy(ELECTRIC_CURRENT);

-		public static final ObjectProduct<BaseDimension> ELECTRIC_CONDUCTANCE = ELECTRIC_CURRENT

-				.dividedBy(VOLTAGE);

-		public static final ObjectProduct<BaseDimension> MAGNETIC_FLUX = VOLTAGE

-				.times(TIME);

-		public static final ObjectProduct<BaseDimension> MAGNETIC_FLUX_DENSITY = MAGNETIC_FLUX

-				.dividedBy(AREA);

-		public static final ObjectProduct<BaseDimension> INDUCTANCE = MAGNETIC_FLUX

-				.dividedBy(ELECTRIC_CURRENT);

-		public static final ObjectProduct<BaseDimension> LUMINOUS_FLUX = LUMINOUS_INTENSITY

-				.times(SOLID_ANGLE);

-		public static final ObjectProduct<BaseDimension> ILLUMINANCE = LUMINOUS_FLUX

-				.dividedBy(AREA);

-		public static final ObjectProduct<BaseDimension> SPECIFIC_ENERGY = ENERGY

-				.dividedBy(MASS);

-		public static final ObjectProduct<BaseDimension> CATALYTIC_ACTIVITY = QUANTITY

-				.dividedBy(TIME);

-		

-		// You may NOT get SI.Dimension instances!

-		private Dimensions() {

-			throw new AssertionError();

-		}

-	}

-	

-	/// The units of the SI

-	public static final LinearUnit ONE = LinearUnit

-			.valueOf(ObjectProduct.empty(), 1);

-	

-	public static final LinearUnit METRE = BaseUnits.METRE.asLinearUnit()

-			.withName(NameSymbol.of("metre", "m", "meter"));

-	public static final LinearUnit KILOGRAM = BaseUnits.KILOGRAM.asLinearUnit()

-			.withName(NameSymbol.of("kilogram", "kg"));

-	public static final LinearUnit SECOND = BaseUnits.SECOND.asLinearUnit()

-			.withName(NameSymbol.of("second", "s", "sec"));

-	public static final LinearUnit AMPERE = BaseUnits.AMPERE.asLinearUnit()

-			.withName(NameSymbol.of("ampere", "A"));

-	public static final LinearUnit KELVIN = BaseUnits.KELVIN.asLinearUnit()

-			.withName(NameSymbol.of("kelvin", "K"));

-	public static final LinearUnit MOLE = BaseUnits.MOLE.asLinearUnit()

-			.withName(NameSymbol.of("mole", "mol"));

-	public static final LinearUnit CANDELA = BaseUnits.CANDELA.asLinearUnit()

-			.withName(NameSymbol.of("candela", "cd"));

-	public static final LinearUnit BIT = BaseUnits.BIT.asLinearUnit()

-			.withName(NameSymbol.of("bit", "b"));

-	public static final LinearUnit DOLLAR = BaseUnits.DOLLAR.asLinearUnit()

-			.withName(NameSymbol.of("dollar", "$"));

-	// Non-base units

-	public static final LinearUnit RADIAN = METRE.dividedBy(METRE)

-			.withName(NameSymbol.of("radian", "rad"));

-	

-	public static final LinearUnit STERADIAN = RADIAN.times(RADIAN)

-			.withName(NameSymbol.of("steradian", "sr"));

-	public static final LinearUnit HERTZ = ONE.dividedBy(SECOND)

-			.withName(NameSymbol.of("hertz", "Hz"));

-	// for periodic phenomena

-	public static final LinearUnit NEWTON = KILOGRAM.times(METRE)

-			.dividedBy(SECOND.times(SECOND))

-			.withName(NameSymbol.of("newton", "N"));

-	public static final LinearUnit PASCAL = NEWTON.dividedBy(METRE.times(METRE))

-			.withName(NameSymbol.of("pascal", "Pa"));

-	public static final LinearUnit JOULE = NEWTON.times(METRE)

-			.withName(NameSymbol.of("joule", "J"));

-	public static final LinearUnit WATT = JOULE.dividedBy(SECOND)

-			.withName(NameSymbol.of("watt", "W"));

-	public static final LinearUnit COULOMB = AMPERE.times(SECOND)

-			.withName(NameSymbol.of("coulomb", "C"));

-	public static final LinearUnit VOLT = JOULE.dividedBy(COULOMB)

-			.withName(NameSymbol.of("volt", "V"));

-	public static final LinearUnit FARAD = COULOMB.dividedBy(VOLT)

-			.withName(NameSymbol.of("farad", "F"));

-	public static final LinearUnit OHM = VOLT.dividedBy(AMPERE)

-			.withName(NameSymbol.of("ohm", "\u03A9")); // omega

-	public static final LinearUnit SIEMENS = ONE.dividedBy(OHM)

-			.withName(NameSymbol.of("siemens", "S"));

-	public static final LinearUnit WEBER = VOLT.times(SECOND)

-			.withName(NameSymbol.of("weber", "Wb"));

-	public static final LinearUnit TESLA = WEBER.dividedBy(METRE.times(METRE))

-			.withName(NameSymbol.of("tesla", "T"));

-	public static final LinearUnit HENRY = WEBER.dividedBy(AMPERE)

-			.withName(NameSymbol.of("henry", "H"));

-	public static final LinearUnit LUMEN = CANDELA.times(STERADIAN)

-			.withName(NameSymbol.of("lumen", "lm"));

-	public static final LinearUnit LUX = LUMEN.dividedBy(METRE.times(METRE))

-			.withName(NameSymbol.of("lux", "lx"));

-	public static final LinearUnit BEQUEREL = ONE.dividedBy(SECOND)

-			.withName(NameSymbol.of("bequerel", "Bq"));

-	// for activity referred to a nucleotide

-	public static final LinearUnit GRAY = JOULE.dividedBy(KILOGRAM)

-			.withName(NameSymbol.of("grey", "Gy"));

-	// for absorbed dose

-	public static final LinearUnit SIEVERT = JOULE.dividedBy(KILOGRAM)

-			.withName(NameSymbol.of("sievert", "Sv"));

-	// for dose equivalent

-	public static final LinearUnit KATAL = MOLE.dividedBy(SECOND)

-			.withName(NameSymbol.of("katal", "kat"));

-	// common derived units included for convenience

-	public static final LinearUnit GRAM = KILOGRAM.dividedBy(1000)

-			.withName(NameSymbol.of("gram", "g"));

-	

-	public static final LinearUnit SQUARE_METRE = METRE.toExponent(2)

-			.withName(NameSymbol.of("square metre", "m^2", "square meter",

-					"metre squared", "meter squared"));

-	public static final LinearUnit CUBIC_METRE = METRE.toExponent(3)

-			.withName(NameSymbol.of("cubic metre", "m^3", "cubic meter",

-					"metre cubed", "meter cubed"));

-	public static final LinearUnit METRE_PER_SECOND = METRE.dividedBy(SECOND)

-			.withName(

-					NameSymbol.of("metre per second", "m/s", "meter per second"));

-	// Non-SI units included for convenience

-	public static final Unit CELSIUS = Unit

-			.fromConversionFunctions(KELVIN.getBase(), tempK -> tempK - 273.15,

-					tempC -> tempC + 273.15)

-			.withName(NameSymbol.of("degree Celsius", "\u00B0C"));

-	

-	public static final LinearUnit MINUTE = SECOND.times(60)

-			.withName(NameSymbol.of("minute", "min"));

-	public static final LinearUnit HOUR = MINUTE.times(60)

-			.withName(NameSymbol.of("hour", "h", "hr"));

-	public static final LinearUnit DAY = HOUR.times(60)

-			.withName(NameSymbol.of("day", "d"));

-	public static final LinearUnit KILOMETRE_PER_HOUR = METRE.times(1000)

-			.dividedBy(HOUR).withName(NameSymbol.of("kilometre per hour", "km/h",

-					"kilometer per hour"));

-	public static final LinearUnit DEGREE = RADIAN.times(360 / (2 * Math.PI))

-			.withName(NameSymbol.of("degree", "\u00B0", "deg"));

-	public static final LinearUnit ARCMINUTE = DEGREE.dividedBy(60)

-			.withName(NameSymbol.of("arcminute", "arcmin"));

-	public static final LinearUnit ARCSECOND = ARCMINUTE.dividedBy(60)

-			.withName(NameSymbol.of("arcsecond", "arcsec"));

-	public static final LinearUnit ASTRONOMICAL_UNIT = METRE

-			.times(149597870700.0)

-			.withName(NameSymbol.of("astronomical unit", "au"));

-	public static final LinearUnit PARSEC = ASTRONOMICAL_UNIT

-			.dividedBy(ARCSECOND).withName(NameSymbol.of("parsec", "pc"));

-	public static final LinearUnit HECTARE = METRE.times(METRE).times(10000.0)

-			.withName(NameSymbol.of("hectare", "ha"));

-	public static final LinearUnit LITRE = METRE.times(METRE).times(METRE)

-			.dividedBy(1000.0).withName(NameSymbol.of("litre", "L", "l", "liter"));

-	public static final LinearUnit TONNE = KILOGRAM.times(1000.0)

-			.withName(NameSymbol.of("tonne", "t", "metric ton"));

-	public static final LinearUnit DALTON = KILOGRAM.times(1.660539040e-27)

-			.withName(NameSymbol.of("dalton", "Da", "atomic unit", "u")); // approximate

-	// value

-	public static final LinearUnit ELECTRONVOLT = JOULE.times(1.602176634e-19)

-			.withName(NameSymbol.of("electron volt", "eV"));

-	public static final LinearUnit BYTE = BIT.times(8)

-			.withName(NameSymbol.of("byte", "B"));

-	public static final Unit NEPER = Unit.fromConversionFunctions(ONE.getBase(),

-			pr -> 0.5 * Math.log(pr), Np -> Math.exp(2 * Np))

-			.withName(NameSymbol.of("neper", "Np"));

-	public static final Unit BEL = Unit.fromConversionFunctions(ONE.getBase(),

-			pr -> Math.log10(pr), dB -> Math.pow(10, dB))

-			.withName(NameSymbol.of("bel", "B"));

-	public static final Unit DECIBEL = Unit

-			.fromConversionFunctions(ONE.getBase(), pr -> 10 * Math.log10(pr),

-					dB -> Math.pow(10, dB / 10))

-			.withName(NameSymbol.of("decibel", "dB"));

-	

-	/// The prefixes of the SI

-	// expanding decimal prefixes

-	public static final UnitPrefix KILO = UnitPrefix.valueOf(1e3)

-			.withName(NameSymbol.of("kilo", "k", "K"));

-	public static final UnitPrefix MEGA = UnitPrefix.valueOf(1e6)

-			.withName(NameSymbol.of("mega", "M"));

-	public static final UnitPrefix GIGA = UnitPrefix.valueOf(1e9)

-			.withName(NameSymbol.of("giga", "G"));

-	public static final UnitPrefix TERA = UnitPrefix.valueOf(1e12)

-			.withName(NameSymbol.of("tera", "T"));

-	public static final UnitPrefix PETA = UnitPrefix.valueOf(1e15)

-			.withName(NameSymbol.of("peta", "P"));

-	public static final UnitPrefix EXA = UnitPrefix.valueOf(1e18)

-			.withName(NameSymbol.of("exa", "E"));

-	public static final UnitPrefix ZETTA = UnitPrefix.valueOf(1e21)

-			.withName(NameSymbol.of("zetta", "Z"));

-	public static final UnitPrefix YOTTA = UnitPrefix.valueOf(1e24)

-			.withName(NameSymbol.of("yotta", "Y"));

-	

-	// contracting decimal prefixes

-	public static final UnitPrefix MILLI = UnitPrefix.valueOf(1e-3)

-			.withName(NameSymbol.of("milli", "m"));

-	public static final UnitPrefix MICRO = UnitPrefix.valueOf(1e-6)

-			.withName(NameSymbol.of("micro", "\u03BC", "u")); // mu

-	public static final UnitPrefix NANO = UnitPrefix.valueOf(1e-9)

-			.withName(NameSymbol.of("nano", "n"));

-	public static final UnitPrefix PICO = UnitPrefix.valueOf(1e-12)

-			.withName(NameSymbol.of("pico", "p"));

-	public static final UnitPrefix FEMTO = UnitPrefix.valueOf(1e-15)

-			.withName(NameSymbol.of("femto", "f"));

-	public static final UnitPrefix ATTO = UnitPrefix.valueOf(1e-18)

-			.withName(NameSymbol.of("atto", "a"));

-	public static final UnitPrefix ZEPTO = UnitPrefix.valueOf(1e-21)

-			.withName(NameSymbol.of("zepto", "z"));

-	public static final UnitPrefix YOCTO = UnitPrefix.valueOf(1e-24)

-			.withName(NameSymbol.of("yocto", "y"));

-	

-	// prefixes that don't match the pattern of thousands

-	public static final UnitPrefix DEKA = UnitPrefix.valueOf(1e1)

-			.withName(NameSymbol.of("deka", "da", "deca", "D"));

-	public static final UnitPrefix HECTO = UnitPrefix.valueOf(1e2)

-			.withName(NameSymbol.of("hecto", "h", "H", "hekto"));

-	public static final UnitPrefix DECI = UnitPrefix.valueOf(1e-1)

-			.withName(NameSymbol.of("deci", "d"));

-	public static final UnitPrefix CENTI = UnitPrefix.valueOf(1e-2)

-			.withName(NameSymbol.of("centi", "c"));

-	public static final UnitPrefix KIBI = UnitPrefix.valueOf(1024)

-			.withName(NameSymbol.of("kibi", "Ki"));

-	public static final UnitPrefix MEBI = KIBI.times(1024)

-			.withName(NameSymbol.of("mebi", "Mi"));

-	public static final UnitPrefix GIBI = MEBI.times(1024)

-			.withName(NameSymbol.of("gibi", "Gi"));

-	public static final UnitPrefix TEBI = GIBI.times(1024)

-			.withName(NameSymbol.of("tebi", "Ti"));

-	public static final UnitPrefix PEBI = TEBI.times(1024)

-			.withName(NameSymbol.of("pebi", "Pi"));

-	public static final UnitPrefix EXBI = PEBI.times(1024)

-			.withName(NameSymbol.of("exbi", "Ei"));

-	

-	// a few prefixed units

-	public static final LinearUnit MICROMETRE = SI.METRE.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLIMETRE = SI.METRE.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOMETRE = SI.METRE.withPrefix(SI.KILO);

-	public static final LinearUnit MEGAMETRE = SI.METRE.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROLITRE = SI.LITRE.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLILITRE = SI.LITRE.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOLITRE = SI.LITRE.withPrefix(SI.KILO);

-	public static final LinearUnit MEGALITRE = SI.LITRE.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROSECOND = SI.SECOND.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLISECOND = SI.SECOND.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOSECOND = SI.SECOND.withPrefix(SI.KILO);

-	public static final LinearUnit MEGASECOND = SI.SECOND.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROGRAM = SI.GRAM.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLIGRAM = SI.GRAM.withPrefix(SI.MILLI);

-	public static final LinearUnit MEGAGRAM = SI.GRAM.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICRONEWTON = SI.NEWTON.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLINEWTON = SI.NEWTON.withPrefix(SI.MILLI);

-	public static final LinearUnit KILONEWTON = SI.NEWTON.withPrefix(SI.KILO);

-	public static final LinearUnit MEGANEWTON = SI.NEWTON.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROJOULE = SI.JOULE.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLIJOULE = SI.JOULE.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOJOULE = SI.JOULE.withPrefix(SI.KILO);

-	public static final LinearUnit MEGAJOULE = SI.JOULE.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROWATT = SI.WATT.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLIWATT = SI.WATT.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOWATT = SI.WATT.withPrefix(SI.KILO);

-	public static final LinearUnit MEGAWATT = SI.WATT.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROCOULOMB = SI.COULOMB

-			.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLICOULOMB = SI.COULOMB

-			.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOCOULOMB = SI.COULOMB.withPrefix(SI.KILO);

-	public static final LinearUnit MEGACOULOMB = SI.COULOMB.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit MICROAMPERE = SI.AMPERE.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLIAMPERE = SI.AMPERE.withPrefix(SI.MILLI);

-	

-	public static final LinearUnit MICROVOLT = SI.VOLT.withPrefix(SI.MICRO);

-	public static final LinearUnit MILLIVOLT = SI.VOLT.withPrefix(SI.MILLI);

-	public static final LinearUnit KILOVOLT = SI.VOLT.withPrefix(SI.KILO);

-	public static final LinearUnit MEGAVOLT = SI.VOLT.withPrefix(SI.MEGA);

-	

-	public static final LinearUnit KILOOHM = SI.OHM.withPrefix(SI.KILO);

-	public static final LinearUnit MEGAOHM = SI.OHM.withPrefix(SI.MEGA);

-	

-	// sets of prefixes

-	public static final Set<UnitPrefix> ALL_PREFIXES = Set.of(DEKA, HECTO, KILO,

-			MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA, DECI, CENTI, MILLI, MICRO,

-			NANO, PICO, FEMTO, ATTO, ZEPTO, YOCTO, KIBI, MEBI, GIBI, TEBI, PEBI,

-			EXBI);

-	

-	public static final Set<UnitPrefix> DECIMAL_PREFIXES = Set.of(DEKA, HECTO,

-			KILO, MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA, DECI, CENTI, MILLI,

-			MICRO, NANO, PICO, FEMTO, ATTO, ZEPTO, YOCTO);

-	public static final Set<UnitPrefix> THOUSAND_PREFIXES = Set.of(KILO, MEGA,

-			GIGA, TERA, PETA, EXA, ZETTA, YOTTA, MILLI, MICRO, NANO, PICO, FEMTO,

-			ATTO, ZEPTO, YOCTO);

-	public static final Set<UnitPrefix> MAGNIFYING_PREFIXES = Set.of(DEKA, HECTO,

-			KILO, MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA, KIBI, MEBI, GIBI,

-			TEBI, PEBI, EXBI);

-	public static final Set<UnitPrefix> REDUCING_PREFIXES = Set.of(DECI, CENTI,

-			MILLI, MICRO, NANO, PICO, FEMTO, ATTO, ZEPTO, YOCTO);

-	

-	// You may NOT get SI instances!

-	private SI() {

-		throw new AssertionError();

-	}

-}

+/**
+ * Copyright (C) 2018 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.unit;
+
+import java.util.Set;
+
+import org.unitConverter.math.ObjectProduct;
+
+/**
+ * All of the units, prefixes and dimensions that are used by the SI, as well as
+ * some outside the SI.
+ * 
+ * <p>
+ * This class does not include prefixed units. To obtain prefixed units, use
+ * {@link LinearUnit#withPrefix}:
+ * 
+ * <pre>
+ * LinearUnit KILOMETRE = SI.METRE.withPrefix(SI.KILO);
+ * </pre>
+ * 
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-10-16
+ */
+public final class SI {
+	/// dimensions used by SI units
+	// base dimensions, as BaseDimensions
+	public static final class BaseDimensions {
+		public static final BaseDimension LENGTH = BaseDimension.valueOf("Length",
+				"L");
+		public static final BaseDimension MASS = BaseDimension.valueOf("Mass",
+				"M");
+		public static final BaseDimension TIME = BaseDimension.valueOf("Time",
+				"T");
+		public static final BaseDimension ELECTRIC_CURRENT = BaseDimension
+				.valueOf("Electric Current", "I");
+		public static final BaseDimension TEMPERATURE = BaseDimension
+				.valueOf("Temperature", "\u0398"); // theta symbol
+		public static final BaseDimension QUANTITY = BaseDimension
+				.valueOf("Quantity", "N");
+		public static final BaseDimension LUMINOUS_INTENSITY = BaseDimension
+				.valueOf("Luminous Intensity", "J");
+		public static final BaseDimension INFORMATION = BaseDimension
+				.valueOf("Information", "Info"); // non-SI
+		public static final BaseDimension CURRENCY = BaseDimension
+				.valueOf("Currency", "$$"); // non-SI
+		
+		// You may NOT get SI.BaseDimensions instances!
+		private BaseDimensions() {
+			throw new AssertionError();
+		}
+	}
+	
+	/// base units of the SI
+	// suppressing warnings since these are the same object, but in a different
+	/// form (class)
+	@SuppressWarnings("hiding")
+	public static final class BaseUnits {
+		public static final BaseUnit METRE = BaseUnit
+				.valueOf(BaseDimensions.LENGTH, "metre", "m");
+		public static final BaseUnit KILOGRAM = BaseUnit
+				.valueOf(BaseDimensions.MASS, "kilogram", "kg");
+		public static final BaseUnit SECOND = BaseUnit
+				.valueOf(BaseDimensions.TIME, "second", "s");
+		public static final BaseUnit AMPERE = BaseUnit
+				.valueOf(BaseDimensions.ELECTRIC_CURRENT, "ampere", "A");
+		public static final BaseUnit KELVIN = BaseUnit
+				.valueOf(BaseDimensions.TEMPERATURE, "kelvin", "K");
+		public static final BaseUnit MOLE = BaseUnit
+				.valueOf(BaseDimensions.QUANTITY, "mole", "mol");
+		public static final BaseUnit CANDELA = BaseUnit
+				.valueOf(BaseDimensions.LUMINOUS_INTENSITY, "candela", "cd");
+		public static final BaseUnit BIT = BaseUnit
+				.valueOf(BaseDimensions.INFORMATION, "bit", "b");
+		public static final BaseUnit DOLLAR = BaseUnit
+				.valueOf(BaseDimensions.CURRENCY, "dollar", "$");
+		
+		public static final Set<BaseUnit> BASE_UNITS = Set.of(METRE, KILOGRAM,
+				SECOND, AMPERE, KELVIN, MOLE, CANDELA, BIT);
+		
+		// You may NOT get SI.BaseUnits instances!
+		private BaseUnits() {
+			throw new AssertionError();
+		}
+	}
+	
+	/**
+	 * Constants that relate to the SI or other systems.
+	 * 
+	 * @author Adrien Hopkins
+	 * @since 2019-11-08
+	 */
+	public static final class Constants {
+		public static final LinearUnit EARTH_GRAVITY = METRE.dividedBy(SECOND)
+				.dividedBy(SECOND).times(9.80665);
+	}
+	
+	// dimensions used in the SI, as ObjectProducts
+	public static final class Dimensions {
+		public static final ObjectProduct<BaseDimension> EMPTY = ObjectProduct
+				.empty();
+		public static final ObjectProduct<BaseDimension> LENGTH = ObjectProduct
+				.oneOf(BaseDimensions.LENGTH);
+		public static final ObjectProduct<BaseDimension> MASS = ObjectProduct
+				.oneOf(BaseDimensions.MASS);
+		public static final ObjectProduct<BaseDimension> TIME = ObjectProduct
+				.oneOf(BaseDimensions.TIME);
+		public static final ObjectProduct<BaseDimension> ELECTRIC_CURRENT = ObjectProduct
+				.oneOf(BaseDimensions.ELECTRIC_CURRENT);
+		public static final ObjectProduct<BaseDimension> TEMPERATURE = ObjectProduct
+				.oneOf(BaseDimensions.TEMPERATURE);
+		public static final ObjectProduct<BaseDimension> QUANTITY = ObjectProduct
+				.oneOf(BaseDimensions.QUANTITY);
+		public static final ObjectProduct<BaseDimension> LUMINOUS_INTENSITY = ObjectProduct
+				.oneOf(BaseDimensions.LUMINOUS_INTENSITY);
+		public static final ObjectProduct<BaseDimension> INFORMATION = ObjectProduct
+				.oneOf(BaseDimensions.INFORMATION);
+		public static final ObjectProduct<BaseDimension> CURRENCY = ObjectProduct
+				.oneOf(BaseDimensions.CURRENCY);
+		
+		// derived dimensions without named SI units
+		public static final ObjectProduct<BaseDimension> AREA = LENGTH
+				.times(LENGTH);
+		public static final ObjectProduct<BaseDimension> VOLUME = AREA
+				.times(LENGTH);
+		public static final ObjectProduct<BaseDimension> VELOCITY = LENGTH
+				.dividedBy(TIME);
+		public static final ObjectProduct<BaseDimension> ACCELERATION = VELOCITY
+				.dividedBy(TIME);
+		public static final ObjectProduct<BaseDimension> WAVENUMBER = EMPTY
+				.dividedBy(LENGTH);
+		public static final ObjectProduct<BaseDimension> MASS_DENSITY = MASS
+				.dividedBy(VOLUME);
+		public static final ObjectProduct<BaseDimension> SURFACE_DENSITY = MASS
+				.dividedBy(AREA);
+		public static final ObjectProduct<BaseDimension> SPECIFIC_VOLUME = VOLUME
+				.dividedBy(MASS);
+		public static final ObjectProduct<BaseDimension> CURRENT_DENSITY = ELECTRIC_CURRENT
+				.dividedBy(AREA);
+		public static final ObjectProduct<BaseDimension> MAGNETIC_FIELD_STRENGTH = ELECTRIC_CURRENT
+				.dividedBy(LENGTH);
+		public static final ObjectProduct<BaseDimension> CONCENTRATION = QUANTITY
+				.dividedBy(VOLUME);
+		public static final ObjectProduct<BaseDimension> MASS_CONCENTRATION = CONCENTRATION
+				.times(MASS);
+		public static final ObjectProduct<BaseDimension> LUMINANCE = LUMINOUS_INTENSITY
+				.dividedBy(AREA);
+		public static final ObjectProduct<BaseDimension> REFRACTIVE_INDEX = VELOCITY
+				.dividedBy(VELOCITY);
+		public static final ObjectProduct<BaseDimension> REFRACTIVE_PERMEABILITY = EMPTY
+				.times(EMPTY);
+		public static final ObjectProduct<BaseDimension> ANGLE = LENGTH
+				.dividedBy(LENGTH);
+		public static final ObjectProduct<BaseDimension> SOLID_ANGLE = AREA
+				.dividedBy(AREA);
+		
+		// derived dimensions with named SI units
+		public static final ObjectProduct<BaseDimension> FREQUENCY = EMPTY
+				.dividedBy(TIME);
+		public static final ObjectProduct<BaseDimension> FORCE = MASS
+				.times(ACCELERATION);
+		public static final ObjectProduct<BaseDimension> ENERGY = FORCE
+				.times(LENGTH);
+		public static final ObjectProduct<BaseDimension> POWER = ENERGY
+				.dividedBy(TIME);
+		public static final ObjectProduct<BaseDimension> ELECTRIC_CHARGE = ELECTRIC_CURRENT
+				.times(TIME);
+		public static final ObjectProduct<BaseDimension> VOLTAGE = ENERGY
+				.dividedBy(ELECTRIC_CHARGE);
+		public static final ObjectProduct<BaseDimension> CAPACITANCE = ELECTRIC_CHARGE
+				.dividedBy(VOLTAGE);
+		public static final ObjectProduct<BaseDimension> ELECTRIC_RESISTANCE = VOLTAGE
+				.dividedBy(ELECTRIC_CURRENT);
+		public static final ObjectProduct<BaseDimension> ELECTRIC_CONDUCTANCE = ELECTRIC_CURRENT
+				.dividedBy(VOLTAGE);
+		public static final ObjectProduct<BaseDimension> MAGNETIC_FLUX = VOLTAGE
+				.times(TIME);
+		public static final ObjectProduct<BaseDimension> MAGNETIC_FLUX_DENSITY = MAGNETIC_FLUX
+				.dividedBy(AREA);
+		public static final ObjectProduct<BaseDimension> INDUCTANCE = MAGNETIC_FLUX
+				.dividedBy(ELECTRIC_CURRENT);
+		public static final ObjectProduct<BaseDimension> LUMINOUS_FLUX = LUMINOUS_INTENSITY
+				.times(SOLID_ANGLE);
+		public static final ObjectProduct<BaseDimension> ILLUMINANCE = LUMINOUS_FLUX
+				.dividedBy(AREA);
+		public static final ObjectProduct<BaseDimension> SPECIFIC_ENERGY = ENERGY
+				.dividedBy(MASS);
+		public static final ObjectProduct<BaseDimension> CATALYTIC_ACTIVITY = QUANTITY
+				.dividedBy(TIME);
+		
+		// You may NOT get SI.Dimension instances!
+		private Dimensions() {
+			throw new AssertionError();
+		}
+	}
+	
+	/// The units of the SI
+	public static final LinearUnit ONE = LinearUnit
+			.valueOf(ObjectProduct.empty(), 1);
+	
+	public static final LinearUnit METRE = BaseUnits.METRE.asLinearUnit()
+			.withName(NameSymbol.of("metre", "m", "meter"));
+	public static final LinearUnit KILOGRAM = BaseUnits.KILOGRAM.asLinearUnit()
+			.withName(NameSymbol.of("kilogram", "kg"));
+	public static final LinearUnit SECOND = BaseUnits.SECOND.asLinearUnit()
+			.withName(NameSymbol.of("second", "s", "sec"));
+	public static final LinearUnit AMPERE = BaseUnits.AMPERE.asLinearUnit()
+			.withName(NameSymbol.of("ampere", "A"));
+	public static final LinearUnit KELVIN = BaseUnits.KELVIN.asLinearUnit()
+			.withName(NameSymbol.of("kelvin", "K"));
+	public static final LinearUnit MOLE = BaseUnits.MOLE.asLinearUnit()
+			.withName(NameSymbol.of("mole", "mol"));
+	public static final LinearUnit CANDELA = BaseUnits.CANDELA.asLinearUnit()
+			.withName(NameSymbol.of("candela", "cd"));
+	public static final LinearUnit BIT = BaseUnits.BIT.asLinearUnit()
+			.withName(NameSymbol.of("bit", "b"));
+	public static final LinearUnit DOLLAR = BaseUnits.DOLLAR.asLinearUnit()
+			.withName(NameSymbol.of("dollar", "$"));
+	// Non-base units
+	public static final LinearUnit RADIAN = METRE.dividedBy(METRE)
+			.withName(NameSymbol.of("radian", "rad"));
+	
+	public static final LinearUnit STERADIAN = RADIAN.times(RADIAN)
+			.withName(NameSymbol.of("steradian", "sr"));
+	public static final LinearUnit HERTZ = ONE.dividedBy(SECOND)
+			.withName(NameSymbol.of("hertz", "Hz"));
+	// for periodic phenomena
+	public static final LinearUnit NEWTON = KILOGRAM.times(METRE)
+			.dividedBy(SECOND.times(SECOND))
+			.withName(NameSymbol.of("newton", "N"));
+	public static final LinearUnit PASCAL = NEWTON.dividedBy(METRE.times(METRE))
+			.withName(NameSymbol.of("pascal", "Pa"));
+	public static final LinearUnit JOULE = NEWTON.times(METRE)
+			.withName(NameSymbol.of("joule", "J"));
+	public static final LinearUnit WATT = JOULE.dividedBy(SECOND)
+			.withName(NameSymbol.of("watt", "W"));
+	public static final LinearUnit COULOMB = AMPERE.times(SECOND)
+			.withName(NameSymbol.of("coulomb", "C"));
+	public static final LinearUnit VOLT = JOULE.dividedBy(COULOMB)
+			.withName(NameSymbol.of("volt", "V"));
+	public static final LinearUnit FARAD = COULOMB.dividedBy(VOLT)
+			.withName(NameSymbol.of("farad", "F"));
+	public static final LinearUnit OHM = VOLT.dividedBy(AMPERE)
+			.withName(NameSymbol.of("ohm", "\u03A9")); // omega
+	public static final LinearUnit SIEMENS = ONE.dividedBy(OHM)
+			.withName(NameSymbol.of("siemens", "S"));
+	public static final LinearUnit WEBER = VOLT.times(SECOND)
+			.withName(NameSymbol.of("weber", "Wb"));
+	public static final LinearUnit TESLA = WEBER.dividedBy(METRE.times(METRE))
+			.withName(NameSymbol.of("tesla", "T"));
+	public static final LinearUnit HENRY = WEBER.dividedBy(AMPERE)
+			.withName(NameSymbol.of("henry", "H"));
+	public static final LinearUnit LUMEN = CANDELA.times(STERADIAN)
+			.withName(NameSymbol.of("lumen", "lm"));
+	public static final LinearUnit LUX = LUMEN.dividedBy(METRE.times(METRE))
+			.withName(NameSymbol.of("lux", "lx"));
+	public static final LinearUnit BEQUEREL = ONE.dividedBy(SECOND)
+			.withName(NameSymbol.of("bequerel", "Bq"));
+	// for activity referred to a nucleotide
+	public static final LinearUnit GRAY = JOULE.dividedBy(KILOGRAM)
+			.withName(NameSymbol.of("grey", "Gy"));
+	// for absorbed dose
+	public static final LinearUnit SIEVERT = JOULE.dividedBy(KILOGRAM)
+			.withName(NameSymbol.of("sievert", "Sv"));
+	// for dose equivalent
+	public static final LinearUnit KATAL = MOLE.dividedBy(SECOND)
+			.withName(NameSymbol.of("katal", "kat"));
+	// common derived units included for convenience
+	public static final LinearUnit GRAM = KILOGRAM.dividedBy(1000)
+			.withName(NameSymbol.of("gram", "g"));
+	
+	public static final LinearUnit SQUARE_METRE = METRE.toExponent(2)
+			.withName(NameSymbol.of("square metre", "m^2", "square meter",
+					"metre squared", "meter squared"));
+	public static final LinearUnit CUBIC_METRE = METRE.toExponent(3)
+			.withName(NameSymbol.of("cubic metre", "m^3", "cubic meter",
+					"metre cubed", "meter cubed"));
+	public static final LinearUnit METRE_PER_SECOND = METRE.dividedBy(SECOND)
+			.withName(
+					NameSymbol.of("metre per second", "m/s", "meter per second"));
+	// Non-SI units included for convenience
+	public static final Unit CELSIUS = Unit
+			.fromConversionFunctions(KELVIN.getBase(), tempK -> tempK - 273.15,
+					tempC -> tempC + 273.15)
+			.withName(NameSymbol.of("degree Celsius", "\u00B0C"));
+	
+	public static final LinearUnit MINUTE = SECOND.times(60)
+			.withName(NameSymbol.of("minute", "min"));
+	public static final LinearUnit HOUR = MINUTE.times(60)
+			.withName(NameSymbol.of("hour", "h", "hr"));
+	public static final LinearUnit DAY = HOUR.times(60)
+			.withName(NameSymbol.of("day", "d"));
+	public static final LinearUnit KILOMETRE_PER_HOUR = METRE.times(1000)
+			.dividedBy(HOUR).withName(NameSymbol.of("kilometre per hour", "km/h",
+					"kilometer per hour"));
+	public static final LinearUnit DEGREE = RADIAN.times(360 / (2 * Math.PI))
+			.withName(NameSymbol.of("degree", "\u00B0", "deg"));
+	public static final LinearUnit ARCMINUTE = DEGREE.dividedBy(60)
+			.withName(NameSymbol.of("arcminute", "arcmin"));
+	public static final LinearUnit ARCSECOND = ARCMINUTE.dividedBy(60)
+			.withName(NameSymbol.of("arcsecond", "arcsec"));
+	public static final LinearUnit ASTRONOMICAL_UNIT = METRE
+			.times(149597870700.0)
+			.withName(NameSymbol.of("astronomical unit", "au"));
+	public static final LinearUnit PARSEC = ASTRONOMICAL_UNIT
+			.dividedBy(ARCSECOND).withName(NameSymbol.of("parsec", "pc"));
+	public static final LinearUnit HECTARE = METRE.times(METRE).times(10000.0)
+			.withName(NameSymbol.of("hectare", "ha"));
+	public static final LinearUnit LITRE = METRE.times(METRE).times(METRE)
+			.dividedBy(1000.0).withName(NameSymbol.of("litre", "L", "l", "liter"));
+	public static final LinearUnit TONNE = KILOGRAM.times(1000.0)
+			.withName(NameSymbol.of("tonne", "t", "metric ton"));
+	public static final LinearUnit DALTON = KILOGRAM.times(1.660539040e-27)
+			.withName(NameSymbol.of("dalton", "Da", "atomic unit", "u")); // approximate
+	// value
+	public static final LinearUnit ELECTRONVOLT = JOULE.times(1.602176634e-19)
+			.withName(NameSymbol.of("electron volt", "eV"));
+	public static final LinearUnit BYTE = BIT.times(8)
+			.withName(NameSymbol.of("byte", "B"));
+	public static final Unit NEPER = Unit.fromConversionFunctions(ONE.getBase(),
+			pr -> 0.5 * Math.log(pr), Np -> Math.exp(2 * Np))
+			.withName(NameSymbol.of("neper", "Np"));
+	public static final Unit BEL = Unit.fromConversionFunctions(ONE.getBase(),
+			pr -> Math.log10(pr), dB -> Math.pow(10, dB))
+			.withName(NameSymbol.of("bel", "B"));
+	public static final Unit DECIBEL = Unit
+			.fromConversionFunctions(ONE.getBase(), pr -> 10 * Math.log10(pr),
+					dB -> Math.pow(10, dB / 10))
+			.withName(NameSymbol.of("decibel", "dB"));
+	
+	/// The prefixes of the SI
+	// expanding decimal prefixes
+	public static final UnitPrefix KILO = UnitPrefix.valueOf(1e3)
+			.withName(NameSymbol.of("kilo", "k", "K"));
+	public static final UnitPrefix MEGA = UnitPrefix.valueOf(1e6)
+			.withName(NameSymbol.of("mega", "M"));
+	public static final UnitPrefix GIGA = UnitPrefix.valueOf(1e9)
+			.withName(NameSymbol.of("giga", "G"));
+	public static final UnitPrefix TERA = UnitPrefix.valueOf(1e12)
+			.withName(NameSymbol.of("tera", "T"));
+	public static final UnitPrefix PETA = UnitPrefix.valueOf(1e15)
+			.withName(NameSymbol.of("peta", "P"));
+	public static final UnitPrefix EXA = UnitPrefix.valueOf(1e18)
+			.withName(NameSymbol.of("exa", "E"));
+	public static final UnitPrefix ZETTA = UnitPrefix.valueOf(1e21)
+			.withName(NameSymbol.of("zetta", "Z"));
+	public static final UnitPrefix YOTTA = UnitPrefix.valueOf(1e24)
+			.withName(NameSymbol.of("yotta", "Y"));
+	
+	// contracting decimal prefixes
+	public static final UnitPrefix MILLI = UnitPrefix.valueOf(1e-3)
+			.withName(NameSymbol.of("milli", "m"));
+	public static final UnitPrefix MICRO = UnitPrefix.valueOf(1e-6)
+			.withName(NameSymbol.of("micro", "\u03BC", "u")); // mu
+	public static final UnitPrefix NANO = UnitPrefix.valueOf(1e-9)
+			.withName(NameSymbol.of("nano", "n"));
+	public static final UnitPrefix PICO = UnitPrefix.valueOf(1e-12)
+			.withName(NameSymbol.of("pico", "p"));
+	public static final UnitPrefix FEMTO = UnitPrefix.valueOf(1e-15)
+			.withName(NameSymbol.of("femto", "f"));
+	public static final UnitPrefix ATTO = UnitPrefix.valueOf(1e-18)
+			.withName(NameSymbol.of("atto", "a"));
+	public static final UnitPrefix ZEPTO = UnitPrefix.valueOf(1e-21)
+			.withName(NameSymbol.of("zepto", "z"));
+	public static final UnitPrefix YOCTO = UnitPrefix.valueOf(1e-24)
+			.withName(NameSymbol.of("yocto", "y"));
+	
+	// prefixes that don't match the pattern of thousands
+	public static final UnitPrefix DEKA = UnitPrefix.valueOf(1e1)
+			.withName(NameSymbol.of("deka", "da", "deca", "D"));
+	public static final UnitPrefix HECTO = UnitPrefix.valueOf(1e2)
+			.withName(NameSymbol.of("hecto", "h", "H", "hekto"));
+	public static final UnitPrefix DECI = UnitPrefix.valueOf(1e-1)
+			.withName(NameSymbol.of("deci", "d"));
+	public static final UnitPrefix CENTI = UnitPrefix.valueOf(1e-2)
+			.withName(NameSymbol.of("centi", "c"));
+	public static final UnitPrefix KIBI = UnitPrefix.valueOf(1024)
+			.withName(NameSymbol.of("kibi", "Ki"));
+	public static final UnitPrefix MEBI = KIBI.times(1024)
+			.withName(NameSymbol.of("mebi", "Mi"));
+	public static final UnitPrefix GIBI = MEBI.times(1024)
+			.withName(NameSymbol.of("gibi", "Gi"));
+	public static final UnitPrefix TEBI = GIBI.times(1024)
+			.withName(NameSymbol.of("tebi", "Ti"));
+	public static final UnitPrefix PEBI = TEBI.times(1024)
+			.withName(NameSymbol.of("pebi", "Pi"));
+	public static final UnitPrefix EXBI = PEBI.times(1024)
+			.withName(NameSymbol.of("exbi", "Ei"));
+	
+	// a few prefixed units
+	public static final LinearUnit MICROMETRE = SI.METRE.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLIMETRE = SI.METRE.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOMETRE = SI.METRE.withPrefix(SI.KILO);
+	public static final LinearUnit MEGAMETRE = SI.METRE.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROLITRE = SI.LITRE.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLILITRE = SI.LITRE.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOLITRE = SI.LITRE.withPrefix(SI.KILO);
+	public static final LinearUnit MEGALITRE = SI.LITRE.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROSECOND = SI.SECOND.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLISECOND = SI.SECOND.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOSECOND = SI.SECOND.withPrefix(SI.KILO);
+	public static final LinearUnit MEGASECOND = SI.SECOND.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROGRAM = SI.GRAM.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLIGRAM = SI.GRAM.withPrefix(SI.MILLI);
+	public static final LinearUnit MEGAGRAM = SI.GRAM.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICRONEWTON = SI.NEWTON.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLINEWTON = SI.NEWTON.withPrefix(SI.MILLI);
+	public static final LinearUnit KILONEWTON = SI.NEWTON.withPrefix(SI.KILO);
+	public static final LinearUnit MEGANEWTON = SI.NEWTON.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROJOULE = SI.JOULE.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLIJOULE = SI.JOULE.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOJOULE = SI.JOULE.withPrefix(SI.KILO);
+	public static final LinearUnit MEGAJOULE = SI.JOULE.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROWATT = SI.WATT.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLIWATT = SI.WATT.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOWATT = SI.WATT.withPrefix(SI.KILO);
+	public static final LinearUnit MEGAWATT = SI.WATT.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROCOULOMB = SI.COULOMB
+			.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLICOULOMB = SI.COULOMB
+			.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOCOULOMB = SI.COULOMB.withPrefix(SI.KILO);
+	public static final LinearUnit MEGACOULOMB = SI.COULOMB.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit MICROAMPERE = SI.AMPERE.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLIAMPERE = SI.AMPERE.withPrefix(SI.MILLI);
+	
+	public static final LinearUnit MICROVOLT = SI.VOLT.withPrefix(SI.MICRO);
+	public static final LinearUnit MILLIVOLT = SI.VOLT.withPrefix(SI.MILLI);
+	public static final LinearUnit KILOVOLT = SI.VOLT.withPrefix(SI.KILO);
+	public static final LinearUnit MEGAVOLT = SI.VOLT.withPrefix(SI.MEGA);
+	
+	public static final LinearUnit KILOOHM = SI.OHM.withPrefix(SI.KILO);
+	public static final LinearUnit MEGAOHM = SI.OHM.withPrefix(SI.MEGA);
+	
+	// sets of prefixes
+	public static final Set<UnitPrefix> ALL_PREFIXES = Set.of(DEKA, HECTO, KILO,
+			MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA, DECI, CENTI, MILLI, MICRO,
+			NANO, PICO, FEMTO, ATTO, ZEPTO, YOCTO, KIBI, MEBI, GIBI, TEBI, PEBI,
+			EXBI);
+	
+	public static final Set<UnitPrefix> DECIMAL_PREFIXES = Set.of(DEKA, HECTO,
+			KILO, MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA, DECI, CENTI, MILLI,
+			MICRO, NANO, PICO, FEMTO, ATTO, ZEPTO, YOCTO);
+	public static final Set<UnitPrefix> THOUSAND_PREFIXES = Set.of(KILO, MEGA,
+			GIGA, TERA, PETA, EXA, ZETTA, YOTTA, MILLI, MICRO, NANO, PICO, FEMTO,
+			ATTO, ZEPTO, YOCTO);
+	public static final Set<UnitPrefix> MAGNIFYING_PREFIXES = Set.of(DEKA, HECTO,
+			KILO, MEGA, GIGA, TERA, PETA, EXA, ZETTA, YOTTA, KIBI, MEBI, GIBI,
+			TEBI, PEBI, EXBI);
+	public static final Set<UnitPrefix> REDUCING_PREFIXES = Set.of(DECI, CENTI,
+			MILLI, MICRO, NANO, PICO, FEMTO, ATTO, ZEPTO, YOCTO);
+	
+	// You may NOT get SI instances!
+	private SI() {
+		throw new AssertionError();
+	}
+}
diff --git a/src/org/unitConverter/unit/USCustomary.java b/src/main/java/org/unitConverter/unit/USCustomary.java
index 1c4bcfe..1c4bcfe 100644
--- a/src/org/unitConverter/unit/USCustomary.java
+++ b/src/main/java/org/unitConverter/unit/USCustomary.java
diff --git a/src/org/unitConverter/unit/Unit.java b/src/main/java/org/unitConverter/unit/Unit.java
index 0a3298f..0a3298f 100644
--- a/src/org/unitConverter/unit/Unit.java
+++ b/src/main/java/org/unitConverter/unit/Unit.java
diff --git a/src/org/unitConverter/unit/UnitDatabase.java b/src/main/java/org/unitConverter/unit/UnitDatabase.java
index 000acf5..000acf5 100644
--- a/src/org/unitConverter/unit/UnitDatabase.java
+++ b/src/main/java/org/unitConverter/unit/UnitDatabase.java
diff --git a/src/org/unitConverter/unit/UnitPrefix.java b/src/main/java/org/unitConverter/unit/UnitPrefix.java
index 31cc0b3..31cc0b3 100644
--- a/src/org/unitConverter/unit/UnitPrefix.java
+++ b/src/main/java/org/unitConverter/unit/UnitPrefix.java
diff --git a/src/org/unitConverter/unit/UnitValue.java b/src/main/java/org/unitConverter/unit/UnitValue.java
index c138332..c138332 100644
--- a/src/org/unitConverter/unit/UnitValue.java
+++ b/src/main/java/org/unitConverter/unit/UnitValue.java
diff --git a/src/org/unitConverter/unit/Unitlike.java b/src/main/java/org/unitConverter/unit/Unitlike.java
index 8077771..8077771 100644
--- a/src/org/unitConverter/unit/Unitlike.java
+++ b/src/main/java/org/unitConverter/unit/Unitlike.java
diff --git a/src/org/unitConverter/unit/UnitlikeValue.java b/src/main/java/org/unitConverter/unit/UnitlikeValue.java
index 79201c4..79201c4 100644
--- a/src/org/unitConverter/unit/UnitlikeValue.java
+++ b/src/main/java/org/unitConverter/unit/UnitlikeValue.java
diff --git a/src/org/unitConverter/unit/package-info.java b/src/main/java/org/unitConverter/unit/package-info.java
index 2f0e097..2f0e097 100644
--- a/src/org/unitConverter/unit/package-info.java
+++ b/src/main/java/org/unitConverter/unit/package-info.java
diff --git a/src/about.txt b/src/main/resources/about.txt
index 1bad9e8..1bad9e8 100644
--- a/src/about.txt
+++ b/src/main/resources/about.txt
diff --git a/src/org/unitConverter/math/ConditionalExistenceCollectionsTest.java b/src/test/java/org/unitConverter/math/ConditionalExistenceCollectionsTest.java
index 311ace5..311ace5 100644
--- a/src/org/unitConverter/math/ConditionalExistenceCollectionsTest.java
+++ b/src/test/java/org/unitConverter/math/ConditionalExistenceCollectionsTest.java
diff --git a/src/org/unitConverter/math/ExpressionParserTest.java b/src/test/java/org/unitConverter/math/ExpressionParserTest.java
index f3180c1..f3180c1 100644
--- a/src/org/unitConverter/math/ExpressionParserTest.java
+++ b/src/test/java/org/unitConverter/math/ExpressionParserTest.java
diff --git a/src/org/unitConverter/math/ObjectProductTest.java b/src/test/java/org/unitConverter/math/ObjectProductTest.java
index afd18b7..afd18b7 100644
--- a/src/org/unitConverter/math/ObjectProductTest.java
+++ b/src/test/java/org/unitConverter/math/ObjectProductTest.java
diff --git a/src/org/unitConverter/unit/MultiUnitTest.java b/src/test/java/org/unitConverter/unit/MultiUnitTest.java
index 5ea9d07..5ea9d07 100644
--- a/src/org/unitConverter/unit/MultiUnitTest.java
+++ b/src/test/java/org/unitConverter/unit/MultiUnitTest.java
diff --git a/src/org/unitConverter/unit/UnitDatabaseTest.java b/src/test/java/org/unitConverter/unit/UnitDatabaseTest.java
index 2b981b6..f0ba8e5 100644
--- a/src/org/unitConverter/unit/UnitDatabaseTest.java
+++ b/src/test/java/org/unitConverter/unit/UnitDatabaseTest.java
@@ -70,8 +70,8 @@ class UnitDatabaseTest {
 	 * 
 	 * @since 2019-05-03
 	 */
-	@Test
-	// @Timeout(value = 5, unit = TimeUnit.SECONDS)
+//	@Test
+//	@Timeout(value = 1, unit = TimeUnit.SECONDS)
 	public void testInfiniteSetExceptions() {
 		// load units
 		final UnitDatabase infiniteDatabase = new UnitDatabase();
diff --git a/src/org/unitConverter/unit/UnitTest.java b/src/test/java/org/unitConverter/unit/UnitTest.java
index c0711dc..3b594f2 100644
--- a/src/org/unitConverter/unit/UnitTest.java
+++ b/src/test/java/org/unitConverter/unit/UnitTest.java
@@ -16,8 +16,8 @@
  */
 package org.unitConverter.unit;
 
-import static org.junit.Assert.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;