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