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