checkNotNull(entryPredicate);
    return (unfiltered instanceof FilteredSetMultimap)
        ? filterFiltered((FilteredSetMultimap<K, V>) unfiltered, entryPredicate)
        : new FilteredEntrySetMultimap<K, V>(checkNotNull(unfiltered), entryPredicate);
  }

  /**
   * Support removal operations when filtering a filtered multimap. Since a filtered multimap has