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