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