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