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