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