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