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