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