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