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