People's Education Edition, the first volume of wide-angle shooting game in second grade mathematics, such as 1-3-4-2, how many different styles can you play?
Is it any of these four numbers?
If there are, there are 24 arrangements.
There are six kinds of 1 23412431342132414231432.
If we start with the other three numbers, the same is true.
So it should be 6*4=24.