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