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