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  1. or download this
    use strict;
use warnings;
...

clean ($hashvar);
$hashvar = undef;
  2. or download this
    use strict;
use warnings;
...

clean ($hashvar);
Dump ($hashvar);
  3. or download this
    $HASH1 = { hemp => {
           hay => { go => 1 },
           may => [ 'way' ]
         } };