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