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