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