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Thanks for the tutorial. I tried this a few years ago and didn’t do too well. It’s clearer now and still much clearer than my George Bain book. I have a question about the exercises. How do you decide what route to take through the more complicated shapes? There are sometimes multiple ways through and so I don’t understand the choice you make at a three way junction. Here are two routes for one of the shapes above, one numbered in red and one in black. There’s probably more. Am I missing something obvious? Thanks (...)