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