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