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