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