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