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