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All the Perl that's Practical to Extract and Report

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  • The cute trick is to build another table containing the path of each node ("." means that this is node 19 whose parent is node 12 whose parent is node 5 whose parent is node 1).

    Beware that this is a premature optimization.

    While this technique works fine with a static tree, it makes tree transformations hideously difficult. Imagine the pain that comes from moving node 12 to be a sibling of node 5, or removing node 5 and consequently promoting their children up a level.

    The other technique