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