}

        @Override
        public boolean remove(final Object o) {
            return parent.remove(o);
        }

        @Override
        public boolean containsAll(final Collection<?> c) {
            return parent.containsAll(c);
        }

        @Override
        public boolean addAll(final Collection<? extends E> c) {
            return parent.addAll(c);
        }

        @Override

   * A sensible implementation of {@link SortedMultiset#elementSet} in terms of the following
   * methods: {@link SortedMultiset#clear}, {@link SortedMultiset#comparator}, {@link
   * SortedMultiset#contains}, {@link SortedMultiset#containsAll}, {@link SortedMultiset#count},
   * {@link SortedMultiset#firstEntry} {@link SortedMultiset#headMultiset}, {@link
   * SortedMultiset#isEmpty}, {@link SortedMultiset#lastEntry}, {@link SortedMultiset#subMultiset},

    @Override
    public boolean contains(@Nullable Object o) {
      refreshIfEmpty();
      return delegate.contains(o);
    }

    @Override
    public boolean containsAll(Collection<?> c) {
      refreshIfEmpty();
      return delegate.containsAll(c);
    }

    @Override
    public void clear() {
      int oldSize = size(); // calls refreshIfEmpty
      if (oldSize == 0) {
        return;
      }

  }

  /**
   * A sensible implementation of {@link Multiset#elementSet} in terms of the following methods:
   * {@link ForwardingMultiset#clear}, {@link ForwardingMultiset#contains}, {@link
   * ForwardingMultiset#containsAll}, {@link ForwardingMultiset#count}, {@link
   * ForwardingMultiset#isEmpty}, the {@link Set#size} and {@link Set#iterator} methods of {@link

    Range<Integer> range = Range.closed(3, 5);
    assertTrue(range.containsAll(asList(3, 3, 4, 5)));
    assertFalse(range.containsAll(asList(3, 3, 4, 5, 6)));

    // We happen to know that natural-order sorted sets use a different code
    // path, so we test that separately
    assertTrue(range.containsAll(ImmutableSortedSet.of(3, 3, 4, 5)));
    assertTrue(range.containsAll(ImmutableSortedSet.of(3)));

        parent.clear();
    }

    @Override
    public boolean contains(final Object o) {
        return parent.contains(o);
    }

    @Override
    public boolean containsAll(final Collection<?> c) {
        return parent.containsAll(c);
    }

    @Override
    public boolean equals(final Object o) {
        return parent.equals(o);
    }

    @Override

  /**
   * Returns {@code true} if this multiset contains at least one occurrence of each element in the
   * specified collection.
   *
   * <p>This method refines {@link Collection#containsAll} to further specify that it <b>may not</b>
   * throw an exception in response to any of {@code elements} being null or of the wrong type.
   *

            return parent.add(e);
        }

        public boolean remove(final Object o) {
            return parent.remove(o);
        }

        public boolean containsAll(final Collection<?> c) {
            return parent.containsAll(c);
        }

        public boolean addAll(final Collection<? extends E> c) {
            return parent.addAll(c);
        }

  /**
   * Returns {@code true} if this multiset contains at least one occurrence of each element in the
   * specified collection.
   *
   * <p>This method refines {@link Collection#containsAll} to further specify that it <b>may not</b>
   * throw an exception in response to any of {@code elements} being null or of the wrong type.
   *

    @Override
    public boolean contains(@Nullable Object o) {
      refreshIfEmpty();
      return delegate.contains(o);
    }

    @Override
    public boolean containsAll(Collection<?> c) {
      refreshIfEmpty();
      return delegate.containsAll(c);
    }

    @Override
    public void clear() {
      int oldSize = size(); // calls refreshIfEmpty
      if (oldSize == 0) {
        return;
      }