15
1 0 0 1 1 2 2 1 1 0 1 2 2 1 1 0
2 0 1 2 3 4 3 2 1 2 3 4 3 2 1 0
3 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
4 0 1 2 3 4 5 6 7 6 5 4 3 2 1 0
5 0 1 2 3 2 3 4 3 2 1 0 1 2 1 0
6 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
7 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
8 0 0 0 0 0 0 1 2 1 0 0 0 0 0 0
9 0 0 0 0 0 1 2 3 2 1 0 0 0 0 0
10 0 1 2 3 2 1 2 3 2 1 2 3 2 1 0
11 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0
12 0 1 1 2 2 2 2 2 2 2 2 2 1 1 0
13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
14 0 1 2 1 0 1 2 3 4 5 4 3 2 1 0
15 0 1 2 3 3 2 1 0 1 2 3 3 2 1 0

