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