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