21
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36
1 8
1 9
1 10
1 15
1 16
1 17
2 8
2 15
3 9
3 16
4 10
4 17
5 11
5 14
5 18
5 21
6 12
6 14
6 19
6 21
7 13
7 14
7 20
7 21
8 15
8 16
8 17
9 15
10 16
11 17
12 18
12 21
13 19
13 21
14 20
14 21