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