int createAndPopulate(int reps) {
    int dummy = 0;
    for (int i = 0; i < reps; i++) {
      dummy += impl.create(values).size();
    }
    return dummy;
  }

  @Benchmark
  boolean createPopulateAndRemove(int reps) {
    boolean dummy = false;
    for (int i = 1; i < reps; i++) {
      Map<Element, Element> map = impl.create(values);
      for (Element value : values) {
        dummy |= map.remove(value) == null;