Every child is replaced with a unique string.

Every parent is replaced with the replacement string used the last time it was seen as a child.

It assumes the output is depth-first dump of the tree, and that the same key doesn't occur at different levels in a node path.

In reply to Re^3: Creating tree with unique categories out of parent-child pointer list by ikegami
in thread Creating tree with unique categories out of parent-child pointer list by bryank

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