It is equivalent to sorting 5 balls and 3 baffles.
Any sorting method corresponds to a sorting method.
5 balls, 3 baffles, ***8 positions, 3 positions are baffles, and other positions are balls.
* * *, 3) There are 56 kinds.
Like crickets, crickets, crickets, crickets.
That is, the first box has 2 balls, the second box has 0 balls, the third box has 2 balls, and the fourth box has 1 ball.
The others are similar.