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