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