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