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