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