I've tested your code with the data you provided and it works 100%!
Maybe you should chomp and trim your data to avoid problems with "invisible" whitespaces?
However the output you are showing doesn't fit to the input you posted, since
are never paired in following lines.
Please show the real data next time, at least out of courtesy to the people spending time to help you!
( addicted to the Perl Programming Language)
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