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%singleLevelHash = ( 'thirdLevelSampleKeyOne' => 'thirdLevelSampleValue', 'thirdLevelSampleKeyTwo' => 'thirdLevelSampleValue', 'thirdLevelSampleKeyThree' => 'thirdLevelSampleValue', );
#!/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.