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