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