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