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