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