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