Yes it's fine except for the output should also have
as I need exact matching i.e. only D in input will not delete D1 and D
+A from output.
And in the addition code, if I dont want the new outfile to be sorted.
+And it's a simple appending the strings whatever they be without any
+string matching of file B with file A.
So in the addition requirement if A contains
and B contains
output should be
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