testSubMultisetDistinctElements(SubMultisetSpec.TAIL_CLOSED);
  }

  public void testTailOpenEntrySet() {
    testSubMultisetEntrySet(SubMultisetSpec.TAIL_OPEN);
  }

  public void testTailOpenSize() {
    testSubMultisetSize(SubMultisetSpec.TAIL_OPEN);
  }

  public void testTailOpenDistinctElements() {
    testSubMultisetDistinctElements(SubMultisetSpec.TAIL_OPEN);
  }