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