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