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There were a few other possible ways I would have done this exercise. One was using the multirow formula, to look at the customers ticket transactions and for those customers who either had a burger or pizza and a side or a drink would have been flagged with a meal deal ( Had some difficulties coming up with a way to write the logic).
I went down the road most traveled by using the filter tool for drinks and sides, and joined those back to burgers and pizza's by the ticketID. Then it was a simple unique counts by ticketids to determine the meal deals.