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