7
bottom
5
2
4
10
15
9
1
1
11
2
0
6
6
3
3
1
2
0
0
0
12
4
1
3
5
0
1
5
0
1
3
0
0
2
2
3
1
1
1
3
4
4
5
2
3
3
0
6
0
2
3
1
2
0