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