With the exception of "use xyz.pm" unless its part of the core perl package.
You are violating your own constraint: 
corelist Parallel::ForkManager MIME::Lite Net::Telnet

Parallel::ForkManager was not in CORE (or so I think)

MIME::Lite was not in CORE (or so I think)

Net::Telnet was not in CORE (or so I think)

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In reply to Re: RFC: beginner level script improvement by toolic
in thread RFC: beginner level script improvement by georgecarlin

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