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