* order. They also specify the behavior of the {@code equals}, {@code hashCode}, and {@code
   * toString} methods for the multimap and its returned views. The multimap's {@code get}, {@code
   * removeAll}, and {@code replaceValues} methods return {@code RandomAccess} lists if the factory
   * does. However, the multimap's {@code get} method returns instances of a different class than
   * does {@code factory.get()}.
   *

   * order. They also specify the behavior of the {@code equals}, {@code hashCode}, and {@code
   * toString} methods for the multimap and its returned views. The multimap's {@code get}, {@code
   * removeAll}, and {@code replaceValues} methods return {@code RandomAccess} lists if the factory
   * does. However, the multimap's {@code get} method returns instances of a different class than
   * does {@code factory.get()}.
   *

      synchronized (mutex) {
        return delegate().putAll(multimap);
      }
    }

    @Override
    public Collection<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values) {
      synchronized (mutex) {
        return delegate().replaceValues(key, values); // copy not synchronized
      }
    }

    @Override
    public boolean remove(@Nullable Object key, @Nullable Object value) {

      synchronized (mutex) {
        return delegate().putAll(multimap);
      }
    }

    @Override
    public Collection<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values) {
      synchronized (mutex) {
        return delegate().replaceValues(key, values); // copy not synchronized
      }
    }

    @Override
    public boolean remove(@Nullable Object key, @Nullable Object value) {