As per given question, the letter series is following the below pattern.
a b bb
Using the same pattern, we will get complete letter series.
a b bb /a b bb/a b bb

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

The given letter series in below pattern.
AZB Y
Using the same pattern, we will get complete letter series.
AZB Y /AZ B Y/A Z BY/ A ZBY

The pattern of given letter series is :-
r r S t U
Using the same pattern, we will get complete letter series.
r r S t U/r r S t U/r r S t U/r r S t U

The given letter series in below pattern.
R K S B P M
Using the same pattern, we will get complete letter series.
R K S B P M/ R K S B P M/ R K S

The given letter series in below pattern.
b b c d d
After completing the pattern, we will get complete letter series.
b b c d d/ d d b c c/ c c d b b

As per given question, the letter series is following the below pattern.
a b c d
After using the pattern the complete letter series will be as below.
a b c d/ba cd/ bcad/ bc da/ a b cd

The given letter series in below pattern.
a d b c
Using the same pattern, we will get complete letter series.
a d b c/ a c b d/ a b cd/dcb a /dbc a /cbda

The pattern of given letter series is :-
y z y
Using the same pattern, we will get complete letter series.
y z y/ x z x/ y z y/ x z x/ y z y/ x z x/ y

As per given question, the letter series is following the below pattern.
o o p q
Using the same pattern, we will get complete letter series.
o o p q/ o p o q/ o o p q/ o p o q/o o p q