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