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