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  1. or download this
    $thisname{'frank'} = 1;
$thisname{'lee'} = 2;
$hashname = 'thisname';
print keys(%$hashname);
  2. or download this
    use strict('subs');
$thisname{'frank'} = 1;
$thisname{'lee'} = 2;
$hashname = 'thisname';
print keys(%$hashname);
  3. or download this
    use strict('refs');
$thisname{'frank'} = 1;
$thisname{'lee'} = 2;
$hashname = 'thisname';
print keys(%$hashname);