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