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