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