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