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Not a real bastard, but certainly a step up from the majority of the easier days.
My solution: https://gist.github.com/alexgreenbank/8a2dea0d56bdf989d3e4dc4c9f132533
[EDIT] And a slimmed down version of day 12 with some unnecessary stuff removed: https://gist.github.com/alexgreenbank/6ca5a459f46a72f064d6b2bd3f4450a9
Greenbank
Today's is going to be a real bastard by the looks of it