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