Do you excel?
Logic is very important, and if you code or are a mathematician then sometimes you will not be surprised to find that even machines are defiant, recalcitrant and incorrigible, just like human beings. Take this very simple case, you have a two cylinder lock. In order to undo the lock you need a key which has cuts to match both cylinders (not being a locksmith I do not know the technical term for the cut, please enlighten me). So, if we call the cylinders A and B, then then we can say for any key C that if it is TRUE that the A cut matches the A cylinder AND it is TRUE the B cut matches the B cylinder that the key is a TRUE key that will open the lock.
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