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