;(mod (tree)
;    (defun hash (tree)
;        (if (l tree) (sha256 (hash (f tree)) (hash (r tree))) tree)
;    )
;    (hash tree)
;)

(a (q 2 2 (c 2 (c 5 (q)))) (c (q 2 (i (l 5) (q 11 (a 2 (c 2 (c 9 (q)))) (a 2 (c 2 (c 13 (q))))) (q . 5)) 1) 1))