Today’s puzzle is a new twist on a classic genre: the “common knowledge” hat riddle in which logicians deduce facts about their hats based on what they know, and what they know others know.
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"Those are deeply personal experiences where you want to hear from other people who have been there. I think you can't really get that in other places."
正定，是习近平同志从政起步的地方。当年，正定每年上缴征购粮7600万斤，是“农业学大寨”先进县。可是粮食交得越多，群众收入越低，正定实际上是个“高产穷县”。