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