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