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