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