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Sorry for the delay. Here comes an easy classic:
Among the inhabitants of Mars were various kinds of creatures. One type was friendly to visitors from Earth and always told the truth. Another was hostile and always lied to Earthlings. But the astronauts couldn't tell the difference between them.
"Are you a truth-teller?" astronaut John Armstrong asked a striped Martian he met on the way to the dig.
"He'll say, 'Yes,'" commented a spotted Martian who was nearby. "But he'll be lying."
Who was the truth-teller, the striped Martian or the spotted one?
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