0 1 2 3 4 5 6 7 8 +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
8 | | | | | | | | | | 8
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
7 | | | | | | | | | | 7
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
6 | | | | | | | | | | 6
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
5 | | | | | | | | | | 5
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
4 | | | | | | | | | | 4
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
3 | | | | | | | | | | 3
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
2 | | | | | | | | | | 2
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
1 | | | | | | | | | | 1
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ | | | | | | | | | |
0 | | | | | | | | | | 0
| | | | | | | | | | +---------+---------+---------+---------+---------+---------+---------+---------+---------+ 0 1 2 3 4 5 6 7 8