Query on Hierarchical data

Hi All,
I have  below scenerio
Input as:
outlet
new_outlet
a
b
b
c
c
d
d
a
aa
bb
bb
cc
cc
aa
l
m
m
n
x
y
y
x
expected output will be:
a
d
b
d
c
d
aa
cc
bb
cc
l
n
m
n
x
y
y
x
please help me on this .I tried with connect by prior clause but not able to get exact output.
Many thanks,

Hi  All,
Actually,there are 3 scenerios :
case1: recursive data
input data:
outlet
new_outlet
a
b
b
c
c
d
d
a
output data:
a
a
b
a
c
a
d
a
case 2: Non recursive data with multiple rows
input data:
l
m
m
n
output data:
l
n
m
n
Case 3:Non recursive data with single rows
input data:
x
y
output data:
x
y
Please help me on this.
Thanks,

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