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