Thanks for the follow-up. I believe I now understand your requirements. Since my original solution was almost certainly not what you were after, I added a better one to my original node, which will make it possible to do the from/to lookups you need. Mea culpa; it's been a while since I looked at a probability table. :-)

In reply to Re^3: Best way to read in an XbyX table into a Hash{Key}{Key2}[value] structure by rjt
in thread Best way to read in an XbyX table into a Hash{Key}{Key2}[value] structure by ZWcarp

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