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I was really trying to avoid getting pulled into more addictive geometric challenges from Catriona Shearer (since they can consume your every waking moment), but a recent post by Ben Orlin, \u201cThe Tilted Twin (and other delights)<\/a>,\u201d undermined my intent. As Orlin put it, \u201cThis is a countdown of her three favorite puzzles from October 2019\u201d and they are vintage Shearer. You should check out Olin\u2019s website since there are \u201cMild hints in the text; full spoilers in the comments.\u201d He also has some interesting links to other people\u2019s efforts. (Olin did leave out a crucial part of #1, however, which caused me to think the problem under-determined. Checking Catriona Shearer\u2019s Twitter<\/a> I found the correct statement, which I have used here.)<\/p>\n I have to admit, I personally found the difficulty of these puzzles a bit more challenging than before (unless I am getting rusty) and the difficulty in the order Olin listed. Again, the solutions (I found) are simple but mostly tricky to discover. I solved the problems before looking at Olin\u2019s or others\u2019 solutions.<\/p>\n