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