Answer Posted / purba

Input:
A
B
B
C
D
D
D

Required output:
A
B
C
D

Solution:
Seq file----->sort stage(create key change column for the I/p key row)
O/p:
A 1
B 1
B 0
C 1
D 1
D 0
D 0

Now take filter stage to filter for key column=0 & keycol=1
We get 2 outputs:
A. B
B. D
C. D
D

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