(source [0, 0] - [1, 0]
  (sqr_tup_lit [0, 0] - [0, 48]
    (kwd_lit [0, 1] - [0, 6])
    (sqr_tup_lit [0, 7] - [0, 47]
      (kwd_lit [0, 8] - [0, 13])
      (sqr_tup_lit [0, 14] - [0, 46]
        (kwd_lit [0, 15] - [0, 17])
        (str_lit [0, 18] - [0, 45])))))
