How to Create the Rules for This Password Structure

[Chick3nman]

This sounds like the Xfinity default password format. The way I accomplished it was to setup a ruleset that puts the numbers in the middle of an already combined wordlist using the inset rule. It's fairly simple to do, an example of a word and rule combo would look like this:

Word:
creekbasket

Rule:
i58 i69 i73 i87