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