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