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