The line

print FH
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does not make sense. Did you mean

print FH $_;
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UPDATE: A pair of {} is missing after the "if" line as well. print FH $; does not make sense either.

Can you make the script work in your sense, and re-post to make sure I can look at the right one? It is a bit difficult to guess what the issue is...

CORRECTION: It seems to create your desired output now...