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