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