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