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