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