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