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  1. or download this
    use strict;
use warnings;
...
    Dump \%opt;
    print "\n";
}
  2. or download this
    -p -q
$HASH1 = {
...

-p
$HASH1 = { p => 1 };
  3. or download this
    if (! exists $opt{s} and ! exists $opt{t}) {