return emptySet();
  }

  protected Collection<Method> suppressForEmptyNavigableSet() {
    return emptySet();
  }

  protected Collection<Method> suppressForEmptySortedSet() {
    return emptySet();
  }

  protected Collection<Method> suppressForSingletonSet() {
    return emptySet();
  }

  protected Collection<Method> suppressForHashSet() {