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