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