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@grams
Day 4: There's no way I can do all that string parsing and validation with just a spreadsheet.
And yet:
https://docs.google.com/spreadsheets/d/1Gj7tgbzQUkiwS5_wJ62lvNfRNmbqBpAjdYLCAD1ulQw/edit#gid=1215894647
(the validation is incredibly weak for edge cases, the formulae close to unreadable, but it gave me a gold star first time)