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