entryItr.remove();
          result = true;
        }
      }
      return result;
    }

    static <K extends @Nullable Object, V extends @Nullable Object> boolean retainAllKeys(
        Map<K, V> map, Predicate<? super Entry<K, V>> entryPredicate, Collection<?> keyCollection) {
      Iterator<Entry<K, V>> entryItr = map.entrySet().iterator();
      boolean result = false;

          entryItr.remove();
          result = true;
        }
      }
      return result;
    }

    static <K extends @Nullable Object, V extends @Nullable Object> boolean retainAllKeys(
        Map<K, V> map, Predicate<? super Entry<K, V>> entryPredicate, Collection<?> keyCollection) {
      Iterator<Entry<K, V>> entryItr = map.entrySet().iterator();
      boolean result = false;