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