public boolean contains(FastFixedSet<E> set) {
      int[] extdata = set.getData();
      int[] intdata = data;

      for (int i = intdata.length - 1; i >= 0; i--) {
        if ((extdata[i] & ~intdata[i]) != 0) {
          return false;
        }
      }

      return true;
    }
public boolean contains(FastFixedSet<E> set)