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