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.