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