@Override
 public Multiset<E> create(Object... elements) {
   return delegate.create(elements);
 }
 @Override
 public Iterable<E> order(List<E> insertionOrder) {
   return delegate.order(insertionOrder);
 }
 @Override
 public SampleElements<E> samples() {
   return delegate.samples();
 }
 @Override
 public E[] createArray(int length) {
   return delegate.createArray(length);
 }
  private TestSuite createSubMultisetSuite(
      SortedMultisetTestSuiteBuilder<E> parentBuilder, final Bound from, final Bound to) {
    final TestMultisetGenerator<E> delegate =
        (TestMultisetGenerator<E>) parentBuilder.getSubjectGenerator();

    Set<Feature<?>> features = new HashSet<Feature<?>>();
    features.add(NoRecurse.SUBMULTISET);
    features.add(RESTRICTS_ELEMENTS);
    features.addAll(parentBuilder.getFeatures());

    if (!features.remove(SERIALIZABLE_INCLUDING_VIEWS)) {
      features.remove(SERIALIZABLE);
    }

    SortedMultiset<E> emptyMultiset = (SortedMultiset<E>) delegate.create();
    final Comparator<? super E> comparator = emptyMultiset.comparator();
    SampleElements<E> samples = delegate.samples();
    @SuppressWarnings("unchecked")
    List<E> samplesList =
        Arrays.asList(samples.e0(), samples.e1(), samples.e2(), samples.e3(), samples.e4());

    Collections.sort(samplesList, comparator);
    final E firstInclusive = samplesList.get(0);
    final E lastInclusive = samplesList.get(samplesList.size() - 1);

    return SortedMultisetTestSuiteBuilder.using(
            new ForwardingTestMultisetGenerator<E>(delegate) {
              @Override
              public SortedMultiset<E> create(Object... entries) {
                @SuppressWarnings("unchecked")
                // we dangerously assume E is a string
                List<E> extremeValues = (List) getExtremeValues();
                @SuppressWarnings("unchecked")
                // map generators must past entry objects
                List<E> normalValues = (List) Arrays.asList(entries);

                // prepare extreme values to be filtered out of view
                Collections.sort(extremeValues, comparator);
                E firstExclusive = extremeValues.get(1);
                E lastExclusive = extremeValues.get(2);
                if (from == Bound.NO_BOUND) {
                  extremeValues.remove(0);
                  extremeValues.remove(0);
                }
                if (to == Bound.NO_BOUND) {
                  extremeValues.remove(extremeValues.size() - 1);
                  extremeValues.remove(extremeValues.size() - 1);
                }

                // the regular values should be visible after filtering
                List<E> allEntries = new ArrayList<E>();
                allEntries.addAll(extremeValues);
                allEntries.addAll(normalValues);
                SortedMultiset<E> multiset =
                    (SortedMultiset<E>) delegate.create(allEntries.toArray());

                // call the smallest subMap overload that filters out the extreme
                // values
                if (from == Bound.INCLUSIVE) {
                  multiset = multiset.tailMultiset(firstInclusive, BoundType.CLOSED);
                } else if (from == Bound.EXCLUSIVE) {
                  multiset = multiset.tailMultiset(firstExclusive, BoundType.OPEN);
                }

                if (to == Bound.INCLUSIVE) {
                  multiset = multiset.headMultiset(lastInclusive, BoundType.CLOSED);
                } else if (to == Bound.EXCLUSIVE) {
                  multiset = multiset.headMultiset(lastExclusive, BoundType.OPEN);
                }

                return multiset;
              }
            })
        .named(parentBuilder.getName() + " subMultiset " + from + "-" + to)
        .withFeatures(features)
        .suppressing(parentBuilder.getSuppressedTests())
        .createTestSuite();
  }