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