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