(source [0, 0] - [1, 0]
  (par_arr_lit [0, 0] - [0, 22]
    (par_arr_lit [0, 2] - [0, 10]
      (num_lit [0, 4] - [0, 5])
      (num_lit [0, 6] - [0, 7])
      (num_lit [0, 8] - [0, 9]))
    (num_lit [0, 11] - [0, 12])
    (par_arr_lit [0, 13] - [0, 21]
      (num_lit [0, 15] - [0, 16])
      (num_lit [0, 17] - [0, 18])
      (num_lit [0, 19] - [0, 20]))))
