combinatorics - Draw a line through all doors - Puzzling Stack Exchange

I saw the following problem on 4chan and couldn't solve it: It's very likely to be some kind of troll (no solution). I'm hoping to see some rigorous proofs that disprove the existence of such a l

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combinatorics - Draw a line through all doors - Puzzling Stack

combinations - Find the number of routes - Mathematics Stack Exchange

combinatorics - Draw a line through all doors - Puzzling Stack

combinatorics - Draw a line through all doors - Puzzling Stack

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