How to override a theme function in Drupal 7

When I first started playing around with drupal I was amazed by all the ways that modules could change the behavior, and extend the functionality of my sites. It seemed like no matter what I wanted to do there was always a module (or three) that would allow me to do it. After using Drupal for a while though, I realized that for some things, I didn't always need all the extra functionality that would come with the modules I was using.

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