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