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