Nice work. And yes, use strict is a real life-saver.
I guess your next lesson will be passing arrays to and from subs—and the mandatory introduction to references, something that took me a while to get my head around. Checkout Randal L Schwartz's Learning Perl Objects, References & Modules or the Perl Cookbook. Good luck.
"Don't ever take a fence down until you know the reason it was put up. " G. K. Chesterton
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