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Good rules of thumb:

If you're going to do something more than twice, make it a function
If you're going to use it in more than two programs, make it a module
If doing it even once made your head hurt, throw it in a module
If it has data you don't want to change yourself, make it work from template files
If the code is could be generated from some sort of parameters, use a templating code generator for it
If it feels like a monkey could do it, check the above list to see what you missed

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