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  1. or download this
    #!/usr/bin/perl
use warnings;
...
push @{ $o->keys }, 'abc';

say for @{ $o->keys };
  2. or download this
    #!/usr/bin/perl
use warnings;
...
$o->add_keys('abc', 'def');

say for $o->get_keys;
  3. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,