If there is a box with seven balls and six seams, 0 ↑ 0 ↑ 0 ↑ 0 ↑ 0 ↑ 0 ↑ 8593a1,6 (arrangement) C 1, 6.

If the box is full. . . Think for yourself, too lazy to type.

The same and different boxes are a question of combination and arrangement.

If you are confused about the basic concepts, you can read the book first, and the examples in the book are king!