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