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