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