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