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