return Iterables.removeIf(
        multimap.unfiltered().entries(),
        and(multimap.entryPredicate(), valuePredicateOnEntries(in(c))));
  }

  @Override
  public boolean retainAll(Collection<?> c) {
    return Iterables.removeIf(
        multimap.unfiltered().entries(),
        and(multimap.entryPredicate(), valuePredicateOnEntries(not(in(c)))));
  }

  @Override
  public void clear() {
    multimap.clear();
  }

      Predicate<? super K> keyPredicate) {
    return compose(keyPredicate, Entry::getKey);
  }

  static <V extends @Nullable Object> Predicate<Entry<?, V>> valuePredicateOnEntries(
      Predicate<? super V> valuePredicate) {
    return compose(valuePredicate, Entry::getValue);
  }

  /**

      Predicate<? super K> keyPredicate) {
    return compose(keyPredicate, Entry::getKey);
  }

  static <V extends @Nullable Object> Predicate<Entry<?, V>> valuePredicateOnEntries(
      Predicate<? super V> valuePredicate) {
    return compose(valuePredicate, Entry::getValue);
  }

  /**

  public static <K extends @Nullable Object, V extends @Nullable Object>
      Multimap<K, V> filterValues(Multimap<K, V> unfiltered, Predicate<? super V> valuePredicate) {
    return filterEntries(unfiltered, Maps.valuePredicateOnEntries(valuePredicate));
  }

  /**
   * Returns a multimap containing the mappings in {@code unfiltered} whose values satisfy a