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