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