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