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