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