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