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mathematics - How many IKEA train track layouts with self-intersections? - Puzzling Stack Exchange
https://puzzling.stackexchange.com/questions/132762/how-many-ikea-train-track-layouts-with-self-intersections
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construction
mathematics
combinatorics
geometry
Recently, I got an IKEA LILLABO train set for my daughter. It has twelve curved segments, each is 1/8th of a circle of radius 1, two straight segments of length 1, and a bridge of length 2 (in top ...
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