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#!/usr/bin/perl

...
print Dumper make_hashref();
print Dumper make_hashref2();
print Dumper make_hashref3();

$VAR1 = {
          'foo' => 'bar'
...
          'foo' => 'bar',
          'boo' => 'too'
        };

$VAR1 = 'foo';
$VAR2 = 'bar';
$VAR3 = 'boo';
$VAR4 = 'too';