*
     * @return the count of {@code element} in the multiset before this call
     * @throws IllegalArgumentException if {@code count} is negative
     */
    @Override
    public int setCount(E element, int count) {
      checkNonnegative(count, "count");
      return (count == 0) ? removeAllOccurrences(element) : unbox(countMap.put(element, count));
    }

    /**

     *
     * @return the count of {@code element} in the multiset before this call
     * @throws IllegalArgumentException if {@code count} is negative
     */
    @Override
    public int setCount(E element, int count) {
      checkNonnegative(count, "count");
      return (count == 0) ? removeAllOccurrences(element) : unbox(countMap.put(element, count));
    }

    /**