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