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