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