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