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