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