}

    @Override
    @CheckForNull
    public Entry<K, V> pollFirstEntry() {
      return Iterables.removeFirstMatching(unfiltered.entrySet(), entryPredicate);
    }

    @Override
    @CheckForNull
    public Entry<K, V> pollLastEntry() {
      return Iterables.removeFirstMatching(unfiltered.descendingMap().entrySet(), entryPredicate);
    }

    @Override

    }

    @Override
    @CheckForNull
    public Entry<K, V> pollFirstEntry() {
      return Iterables.removeFirstMatching(unfiltered.entrySet(), entryPredicate);
    }

    @Override
    @CheckForNull
    public Entry<K, V> pollLastEntry() {
      return Iterables.removeFirstMatching(unfiltered.descendingMap().entrySet(), entryPredicate);
    }

    @Override