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