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Teacher Wang, a second-grade math problem, and three classmates lined up to take pictures and asked how many arrangements there were.
24 ways. Suppose these four people are a, b, c, d,

The accelerated business collection and delivery system (adopted by the post office in the United States) speeds up the acceptance and delivery ... abdc ... acbd ... acdb ... adbc ... adcb, that is, there are six kinds of people on the far left, and there are four people, so there are 4*6=24 kinds.

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