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