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