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