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