Pink girl ,Blue boy

There are 5 blue chairs and 4 pink chairs in a class of nine students , comprising 5 boys and 4 girls. Before lunch, the 5 boys sat on the blue chairs and the 4 girls sat on the pink chairs. If after lunch, no girl sat on the same chair on which she was sitting before lunch, but all the girls sat on pink chairs, in how many ways can all the students be seated?

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