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