Rename Non-dupe

I pulled a m20 duets of mana none dupe pack and got a dupe, when I still have 8 rarers to get in m20. A friend pointed out there's a set of cards in the Non-dupe pack and if you already own that card your going to pull a dupe. Wich is unfair as pack says Non-dupe, so maybe changes to "possible none dupe" so everyone is aware there nonedupe may contain a dupe card