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