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