How to create an iPhone playlist with songs older than 6 months without duplicates?

This is the jest of it, can someone perfect this iPhone shortcut for me? It’s a simple one. It’s just needs to create a playlist with songs that are older than 6 months from their release dates without adding duplicates. Please and thank you. I’ve had it before but accidentally deleted. (Share a link if possible)

[Re-Titled by Moderator]

Original Title: iPhone shortcut