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