You're in the middle of a desert. You come to a crossroad from where there are two paths to be taken. You cannot go back. One path leads to death the other one to life. In the middle of the crossroads sits an old man who knows which path to take. You can ask this man one question, but only one. You also know from legend that this man lies every second time, and tells the truth every second time. What do you ask him to be sure of knowing which way to take?

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