[
[
[[[[["a", "b"], "c"], ["d", "e"]], [[["f", "g"], "h"], [["i", "j"], ["k", ["l", "m"]]]]],
["n", [[["o", "p"], "q"], ["r", "s"]]]], ["t", ["u", "v"]]
],
[["w", ["x", "y"]], "z"]
]
####
[0
[1
. [2
. . [3
. . . [4
. . . . [5
. . . . . [6
. . . . . . "a",
. . . . . . ."b"
. . . . . ],
. . . . . "c"
. . . . ],
. . . . [5
. . . . . "d",
. . . . . "e"
. . . . ]
. . . ],
. . . [4
. . . . [5
. . . . . [6
. . . . . . "f",
. . . . . . "g"
. . . . . ],
. . . . . "h"
. . . . ],
. . . . [5
. . . . . [6
. . . . . . "i",
. . . . . . "j"
. . . . . ],
. . . . . [6
. . . . . . "k",
. . . . . . [7
. . . . . . . "l",
. . . . . . . "m"
. . . . . . ]
. . . . . ]
. . . . ]
. . . ],
. . ],
. . [3
. . . "n",
. . . [4
. . . . [5
. . . . . [6
. . . . . . "o",
. . . . . . "p"
. . . . . ],
. . . . . "q"
. . . . ],
. . . . [5
. . . . . "r",
. . . . . "s"
. . . . ]
. . . ]
. . ],
. ],
. [2
. . "t",
. . [3
. . . "u",
. . . "v"
. . ]
. ],
],
[1
. [2
. . "w",
. . [
. . . "x",
. . . "y"
. . ]
. ],
. "z"
],
]
##
##
___________/\____________
________________/\____________ __/\_
_____________/\______________ /\ /\ \
________/\________ ___/\___ / \ / \ z
__/\__ _____/\____ / __/\__ t /\ w /\
/\ \ /\ __/\__ n /\ \ u v x y
/ \ /\ / \ / /\ / \ /\
/\ c d e /\ h /\ / \ /\ q r s
a b f g i j k /\ o p
l m