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