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