(source [0, 0] - [1, 0]
  (par_tup_lit [0, 0] - [0, 15]
    (sym_lit [0, 1] - [0, 2])
    (num_lit [0, 3] - [0, 4])
    (num_lit [0, 5] - [0, 6])
    (par_tup_lit [0, 7] - [0, 14]
      (sym_lit [0, 8] - [0, 9])
      (num_lit [0, 10] - [0, 11])
      (num_lit [0, 12] - [0, 13]))))
