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