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