code: public static boolean containsOccurrences(
        Multiset<?> superMultiset, Multiset<?> subMultiset) {
      checkNotNull(superMultiset);
      checkNotNull(subMultiset);
      for (Entry<?> entry : subMultiset.entrySet()) {
        int superCount = superMultiset.count(entry.getElement());
        if (superCount < entry.getCount()) {
          return false;
        }
      }
      return true;
    }
docs: Returns {@code true} if {@code subMultiset.count(o) <=
  superMultiset.count(o)} for all {@code o}.
  
  @since 10.0