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I understand the problem but combination locks are just subject to this problem. A few years ago I forgot my ATM Pin. Just 4 digits and I'd used it at least once or twice a week for many years. One day it vanished from my memory. Tried 3 times a day for a few days and just couldn't remember.
I've got a combination lock or two somewhere around the house. Can't use them because I can't remember the numbers.
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