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