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