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