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