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#!/usr/bin/perl -T
use warnings;
...

$_ = $l x 5;
$_ = "$m" x 5;

ANS: $c,$f,$g,$h,$j, and $m are used it ways that trigger warnings
 
...
$_ = $l x 5;     # neither does this
$_ = "$m" x 5;   # but if I do the stringifing myself I get yelled at