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