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