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