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