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QUESTION
There are 12 zodiac signs in total and everyone has his/her own zodiac sign according to the birthday. Suppose we have a group of 25 people.
There are 12 zodiac signs in total and everyone has his/her own zodiac sign according to the birthday. Suppose we have a group of 25 people.
question： Argue that at least one zodiac sign belong to 3 or more people.
