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