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