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Math problem: Four students are sitting in a row of seven seats, and only two seats are adjacent. How many different sitting positions are there?
There are two seats for four people and one seat, that is, one is next to two seats and the other is a separate seat.
(1) Arrange four people first, and use the method of a (4,4) = 24.
(2) Insert two different spaces into five spaces of four people.