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