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