Suppose you wake up in a dungeon, faced with two doors. One of them leads you out of the dungeon; the other leads you to a pit full of poisonous snakes. The doors are watched over by two guards. One of them is a compulsive liar while the other is an occasional liar (let's assume you know who is which). You can only ask one of them which door to take.

Which guard should you ask?

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