return standardContainsAll(collection);
      }

      @Override
      public boolean remove(@CheckForNull Object object) {
        return object != null && Collections2.safeRemove(delegate, object);
      }

      @Override
      public boolean removeAll(Collection<?> c) {
        return standardRemoveAll(c);
      }
    };
  }

  @Override

    }
  }

  /**
   * Delegates to {@link Collection#remove}. Returns {@code false} if the {@code remove} method
   * throws a {@code ClassCastException} or {@code NullPointerException}.
   */
  static boolean safeRemove(Collection<?> collection, @CheckForNull Object object) {
    checkNotNull(collection);
    try {
      return collection.remove(object);
    } catch (ClassCastException | NullPointerException e) {
      return false;

    }
  }

  /**
   * Delegates to {@link Collection#remove}. Returns {@code false} if the {@code remove} method
   * throws a {@code ClassCastException} or {@code NullPointerException}.
   */
  static boolean safeRemove(Collection<?> collection, @CheckForNull Object object) {
    checkNotNull(collection);
    try {
      return collection.remove(object);
    } catch (ClassCastException | NullPointerException e) {
      return false;