Place Unique Instances of Detail Component Types in a Legend

Hi All, I’m new to Dynamo. One of my first goals is to create something that can place each unique instance of a detail component family type (excluding filled regions) into a legend. I’d like to place them in a pattern within a legend view that is a set distance and number across and repeat lines a set number down until the pattern runs out. Being new, I’m at a loss. I’ve looked at but can’t replicate anything that works. Can anyone give any guidance on this? I’m probably trying to make this more basic than it can be or needs to be but it’s what I have started.

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