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