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Forgot to put this in. The "best" solution I've come up with so far is to have a unit level rule that checks to see if the count of any of the tags for the items in this group is greater than 1. It works, but is brute force, like I said. I have the rule automatically validate and exit if the item that raises the limit to 2 is not present, as best practices would dictate.
My problem with this is that every time a new item is added to the group, I have to add another tag count check to this rule.
My code doesn't have bugs; it has undocumented features!
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