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