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