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