So I am making various charts in Pages, and am tracking items in and items out. I have already used the Formula where I can have it add or subtract numerical values and print the result. I am hoping for it to keep track of duplicate strings. For example, lets say I have chart one, with Item1, Item2, Item3 and Item4, then I have chart two, it also has Item1 and Item2, but not 3 or 4. Is there a way for Pages to list the items from the first chart that hasn't been used twice in the second chart? So chart three would print Item3 and Item4. Is this possible? It would really help with quick inventory. Thanks!