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