implements NavigableMap<K, V> {
  /**
   * Returns a {@link Collector} that accumulates elements into an {@code ImmutableSortedMap} whose
   * keys and values are the result of applying the provided mapping functions to the input
   * elements. The generated map is sorted by the specified comparator.
   *
   * <p>If the mapped keys contain duplicates (according to the specified comparator), an {@code

   * }</pre>
   *
   * ... returns {@code "aaa"}.
   */
  public String retainFrom(CharSequence sequence) {
    return negate().removeFrom(sequence);
  }

  /**
   * Returns a string copy of the input character sequence, with each matching BMP character
   * replaced by a given replacement character. For example:
   *
   * <pre>{@code
   * CharMatcher.is('a').replaceFrom("radar", 'o')
   * }</pre>
   *

        Equivalence.equals()
            .onResultOf(
                new Function<String, String>() {
                  @Override
                  public String apply(String input) {
                    return input.toLowerCase();
                  }
                });

    MapDifference<Integer, String> diff1 = Maps.difference(left, right, caseInsensitiveEquivalence);
    assertFalse(diff1.areEqual());

        Equivalence.equals()
            .onResultOf(
                new Function<String, String>() {
                  @Override
                  public String apply(String input) {
                    return input.toLowerCase();
                  }
                });

    MapDifference<Integer, String> diff1 = Maps.difference(left, right, caseInsensitiveEquivalence);
    assertFalse(diff1.areEqual());

  /**
   * Returns a {@code Collector} accumulating entries into a {@code Multimap} generated from the
   * specified supplier. The keys and values of the entries are the result of applying the provided
   * mapping functions to the input elements, accumulated in the encounter order of the stream.
   *
   * <p>Example:
   *
   * <pre>{@code
   * static final ListMultimap<Character, String> FIRST_LETTER_MULTIMAP =

    implements NavigableMap<K, V> {
  /**
   * Returns a {@link Collector} that accumulates elements into an {@code ImmutableSortedMap} whose
   * keys and values are the result of applying the provided mapping functions to the input
   * elements. The generated map is sorted by the specified comparator.
   *
   * <p>If the mapped keys contain duplicates (according to the specified comparator), an {@code

 *   if (value < 0) {
 *     throw new IllegalArgumentException("input is negative: " + value);
 *   }
 *   // calculate square root
 * }
 * }</pre>
 *
 * <p>to be replaced with the more compact
 *
 * <pre>{@code
 * public static double sqrt(double value) {
 *   checkArgument(value >= 0, "input is negative: %s", value);
 *   // calculate square root
 * }
 * }</pre>
 *

      complete(this, /*callInterruptTask=*/ false);
      return true;
    }
    return false;
  }

  /**
   * Sets the result of this {@code Future} to match the supplied input {@code Future} once the
   * supplied {@code Future} is done, unless this {@code Future} has already been cancelled or set
   * (including "set asynchronously," defined below).
   *

      Iterator<? extends T>... inputs) {
    for (Iterator<? extends T> input : checkNotNull(inputs)) {
      checkNotNull(input);
    }
    return concat(consumingForArray(inputs));
  }

  /**
   * Divides an iterator into unmodifiable sublists of the given size (the final list may be
   * smaller). For example, partitioning an iterator containing {@code [a, b, c, d, e]} with a

    return new TypeSet();
  }

  /**
   * Returns the generic form of {@code superclass}. For example, if this is {@code
   * ArrayList<String>}, {@code Iterable<String>} is returned given the input {@code
   * Iterable.class}.
   */
  public final TypeToken<? super T> getSupertype(Class<? super T> superclass) {
    checkArgument(
        this.someRawTypeIsSubclassOf(superclass),