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