.subMultiset(
                  fromElement, BoundType.forBoolean(fromInclusive),
                  toElement, BoundType.forBoolean(toInclusive)));
    }

    @Override
    public NavigableSet<E> headSet(@ParametricNullness E toElement, boolean inclusive) {
      return new NavigableElementSet<>(
          multiset().headMultiset(toElement, BoundType.forBoolean(inclusive)));
    }

    @Override

              .subMultiset(
                  fromElement, BoundType.forBoolean(fromInclusive),
                  toElement, BoundType.forBoolean(toInclusive)));
    }

    @Override
    public NavigableSet<E> headSet(@ParametricNullness E toElement, boolean inclusive) {
      return new NavigableElementSet<>(
          multiset().headMultiset(toElement, BoundType.forBoolean(inclusive)));
    }

    @Override

      return subMap(
          Range.range(
              fromKey, BoundType.forBoolean(fromInclusive),
              toKey, BoundType.forBoolean(toInclusive)));
    }

    @Override
    public NavigableMap<Cut<C>, Range<C>> headMap(Cut<C> toKey, boolean inclusive) {
      return subMap(Range.upTo(toKey, BoundType.forBoolean(inclusive)));
    }

    @Override

    return intersectionInCurrentDomain(
        Range.range(
            fromElement, BoundType.forBoolean(fromInclusive),
            toElement, BoundType.forBoolean(toInclusive)));
  }

  @Override
  ContiguousSet<C> tailSetImpl(C fromElement, boolean inclusive) {
    return intersectionInCurrentDomain(Range.downTo(fromElement, BoundType.forBoolean(inclusive)));
  }

  @GwtIncompatible // not used by GWT emulation
  @Override

      return subMap(
          Range.range(
              fromKey, BoundType.forBoolean(fromInclusive),
              toKey, BoundType.forBoolean(toInclusive)));
    }

    @Override
    public NavigableMap<Cut<C>, Range<C>> headMap(Cut<C> toKey, boolean inclusive) {
      return subMap(Range.upTo(toKey, BoundType.forBoolean(inclusive)));
    }

    @Override

    return intersectionInCurrentDomain(
        Range.range(
            fromElement, BoundType.forBoolean(fromInclusive),
            toElement, BoundType.forBoolean(toInclusive)));
  }

  @Override
  ContiguousSet<C> tailSetImpl(C fromElement, boolean inclusive) {
    return intersectionInCurrentDomain(Range.downTo(fromElement, BoundType.forBoolean(inclusive)));
  }

  @GwtIncompatible // not used by GWT emulation
  @Override

  final boolean inclusive;

  BoundType(boolean inclusive) {
    this.inclusive = inclusive;
  }

  /** Returns the bound type corresponding to a boolean value for inclusivity. */
  static BoundType forBoolean(boolean inclusive) {
    return inclusive ? CLOSED : OPEN;
  }

  final boolean inclusive;

  BoundType(boolean inclusive) {
    this.inclusive = inclusive;
  }

  /** Returns the bound type corresponding to a boolean value for inclusivity. */
  static BoundType forBoolean(boolean inclusive) {
    return inclusive ? CLOSED : OPEN;
  }

      }
      return subSet(
          Range.range(
              fromElement, BoundType.forBoolean(fromInclusive),
              toElement, BoundType.forBoolean(toInclusive)));
    }

    @Override
    ImmutableSortedSet<C> tailSetImpl(C fromElement, boolean inclusive) {
      return subSet(Range.downTo(fromElement, BoundType.forBoolean(inclusive)));
    }

    @Override
    public boolean contains(@CheckForNull Object o) {

      }
      return subSet(
          Range.range(
              fromElement, BoundType.forBoolean(fromInclusive),
              toElement, BoundType.forBoolean(toInclusive)));
    }

    @Override
    ImmutableSortedSet<C> tailSetImpl(C fromElement, boolean inclusive) {
      return subSet(Range.downTo(fromElement, BoundType.forBoolean(inclusive)));
    }

    @Override
    public boolean contains(@CheckForNull Object o) {