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