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