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