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