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