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