Clever Prisoner There was a king in ancient Greece who wanted to execute a group of prisoners. At that time, two methods of execution were popular: beheading and hanging.

The clever prisoner said, "behead."

This sentence put the king in a dilemma. If you really behead him, then he is telling the truth and should be hanged for telling the truth. But if he is hanged, it is a lie for him to say "I will be beheaded", and lying should be beheaded. Or hanged, or beheaded, there is no way to carry out the king's original decision, so we have to release it.

Judging from the form of reasoning, the prisoner constructed the following dilemma reasoning in front of the king:

If you behead him, it will go against the king's original decision; If he is hanged, it will also go against the king's original decision.

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