Challenge: Dumping trees.

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[
    [
...
    ], 
    [["w", ["x", "y"]], "z"]
]

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[0
    [1
...
    .   "z"
    ],
]

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                                                ___________/\_________
+___
                               ________________/\____________         
+__/\_
...
  /\   c  d  e   /\   h   /\    /  \        /\   q  r  s
 a  b           f  g     i  j  k   /\      o  p
                                  l  m

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