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