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