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