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