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