Study the following series.
8 N I L Z S P M 6 A 9 1 G 4 F 2 V Q $ W
Find what should come in place of the question mark(?)
NL , ? , MA , 9G
There is a gap of 2 between the first characters of each of the given pair. The second character of each pair is separated by one position to the right of the first character.