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%singleLevelHash = (
 'thirdLevelSampleKeyOne'   => 'thirdLevelSampleValue',
 'thirdLevelSampleKeyTwo'   => 'thirdLevelSampleValue',
 'thirdLevelSampleKeyThree' => 'thirdLevelSampleValue',
);

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#!/usr/bin/perl
use strict;
...

firstSampleKey
Type of argument to keys on reference must be unblessed hashref or arr
+ayref at hash.pl line 21.