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