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