How to Find Minimal Pairs for Back Unrounded Vowels

I don't really need to tell people why certain forms are the way they are. It's just I give all the forms for each one and then I didn't really go into the class 2 that much. You will see that vowel harmony applies to them but that's about it. When I do nouns and verbs, those are open classes and verbs have some stem changes that come from some of my sound changes that are also phonological processes too. So none of those sections are really complete yet but I'm currently working hard on the presentation of verbal aspects. My iterative aspect is a bit weird, not weird but a bit different so I need to find a different place to put things