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