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