Done! Adapted from http://hectorcorrea.com/Blog/Drawing-a-Binary-Tree-in-Ruby, where descendents are called children :)
_______________/\_ /\_ /\_ z
___/\_____ /\_____ t /\ w /\
_/\_ _/\___ n _/\_ u v x y
_/\ /\ _/\ _/\_ _/\ /\
/\ c d e /\ h /\ /\_ /\ q r s
a b f g i j k /\ o p
Naturally nodes with a width greater than 2 chars breaks it :)
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