@Override
      Map<K, Collection<V>> map() {
        return AsMap.this;
      }

      @Override
      public Iterator<Entry<K, Collection<V>>> iterator() {
        return Maps.asMapEntryIterator(multimap.keySet(), key -> multimap.get(key));
      }

      @Override
      public boolean remove(@CheckForNull Object o) {
        if (!contains(o)) {
          return false;
        }