Prepend, append, and prepend+append words from one list to words from another list

[COOLak]

https://hashcat.net/wiki/doku.php?id=rule_based_attack

I've already seen this page. I don't see any instruction on how to mutually append, prepend, and append+prepend words from two files to one another.

Put appends in for example append.rule, prepends in prepend.rule and then use

Code:

-r append.rule -r prepend.rule

And throw a : rule in each file as well...

I don't understand. How do I make it know which rule file is for prepending and which one is for appending?