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