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