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