common riddle: there is two speaking doors, one is always lying and one is always honest, your objective is find the right door to proceed, one door goes to heaven and one goes to hell, what would you do to out smart the system?
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The simple answer is to ask either one what the other guard would say and go through the opposite door. But that won't work. If the first guard is telling the truth about one of them always telling the truth the other guard must lie so "one of us speaks only lies" must be a lie.