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