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