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