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