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