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