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