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