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