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