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