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