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