The given letter series in below pattern.
a b n cb
Using the same pattern, we will get complete letter series.
a b n cb/ ab n c b/ abncb

As per given question, the letter series is following the below pattern.
l m n n ml
Using the same pattern, we will get complete letter series.
l m n n ml / lm n n m l

The pattern of given letter series is :-
ab a a
Using the same pattern, we will get complete letter series.
ab a a/a b aa/a b a a/ ab a a

The pattern of given letter series is :-
aba c baca
After using the pattern the complete letter series will be as below.
aba c baca / a ba c baca / abac b aca

The pattern of letter series is given in figure :-
a c b / d c e
After using the pattern the complete letter series will be as below.

As per given question, the letter series is following the below pattern.
Q S T R
After using the pattern the complete letter series will be as below.
Q S T R / Q S T R/ Q S TR/ Q STR

The pattern of given letter series is :-
h feg
Using the same pattern, we will get complete letter series.
h feg / h feg / h f eg / hfe g

The given letter series in below pattern.
ac a c
Using the same pattern, we will get complete letter series.
ac a c / ab a b / a c a c / aba b / a c a c

The pattern of given letter series is :-
an a
After using the pattern the complete letter series will be as below.
an a / nn a/ ana / n na / a na / n n a

As per given question, the letter series is following the below pattern.
a b ba
After using the pattern the complete letter series will be as below.
a b ba / a bb a / ab b a