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