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