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I broke it in a bad way. Pattern chugged along fine and then it froze and a random white rectangle appeared. (N=3) https://imgur.com/a/IlmdkC6

Ah, sorry I didn't make that clear... That would be a contradiction, as no pattern was found to fit in that area. You need to generate again.

Interesting. Well it only happened once so I guess I just got bad luck. Fun demo!