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