Assistance Needed with Unique Outputs!

Hello everyone! A few years ago I got some help with a randomizer of mine and it made it into a wonderful little tool to play around with. Link to it here!

I've since expanded upon it, and come into a small problem with the more I add to it: unique outputs.

There are, in total, 4 outputs I'm concerned with the most (the types). Is there any way to make it so that the code keeps track of all 4 outputs and insures they are all unique?

I've looked over the documentation and I think it's a touch out of my current skillset. Thank you to anyone who takes the time to help out!