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