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