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