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