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