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