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