We have country, high point and low point fields.
We have country on the front that’s fine.
Then, we have high point on the front and we run into issues. High point isn’t always unique e.g. Everest (Nepal, China), and it’s far worse for low point (various seas). See List of elevation extremes by country - Wikipedia. Please may we have a unique conditional replacement? Basically rather than just having a condition for both empty and non-empty, there be a third condition that say is this field unique if so generate a card.
There are a lot more use cases. Basically any object that has partially unique property values suffers in the same way. Ideally, when making cards, you’d have one property on the front and recall all the others. You’d do this for each property, but you don’t want a card generated if the property value refers to multiple objects.