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