Where you have

%words = qw    (
        fred    camel
        barney    llama
        betty     alpaca
        wilma   alpaca
        );
[download]

That should be

my %words = qw    (
        fred    camel
        barney    llama
        betty     alpaca
        wilma   alpaca
        );
[download]

my declares a variable to be a lexical, which means "non-global". You have to declare all your variables the first time you use it to be 'strict', so to speak.

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/me wants to be the brightest bulb in the chandelier!

Vote paco for President!