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