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