The Master Lock 1500iD is a locker lock that functions by pushing a button in one of four directions. Combinations can be of infinite length, but of course the lock cannot store infinite information: instead, some combinations lead to the same end result, and thus multiple combinations can open the lock. I used three main sources for this project: This video, This reply to a comment on that video, and This brief paper

Type your code here (using "r", "l", "u", "d" for right, left, up, down, respectively):
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Maximum combination length:
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