code: public List<Integer> until(int end) {
                  List<Integer> list = new ArrayList<>();
                  for (int i = this.n; i < end; ++i) {
                          list.add(i);
                  }
                  return list;
          }
docs: generate a list containing values from integer represented by this object<br>
  to given integer (exclusive)<br>
  e.g. <code>$(0).until(20)</code> means list(0,1,2,...,19)
  
  @param end end integer (exclusive)
  @return a list