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Solve the problem of mathematical modeling.
It can be solved by using the idea of mapping. We can refer to the topic of the 2000 Korea Mathematical Olympics and draw the following conclusions:

If the number of committee members is m, any n committee members can't be opened, and any n+ 1 committee members can be opened, then the number of locks is C(m, n) (indicating the number of combinations from n to m).

For this problem, C( 1 1, 5)=396 is the demand.