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