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