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