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