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Nov 6, 2020 at 18:13 history edited Sam Hopkins
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Nov 6, 2020 at 15:59 comment added David E Speyer @SamHopkins I certainly anticipate something like this, but haven't found a specific version that works.
Nov 6, 2020 at 15:23 comment added Sam Hopkins This is vague, of course, but have you tried something like "don't turn at bad double crossings."
Nov 6, 2020 at 13:38 history asked David E Speyer CC BY-SA 4.0