Well, hate to argue, but there are a number of 4-door hatchbacks out there. While my earlier statement regarding vertical openings isn't always true (especially in regards to 2-doors), it is still rather valid. Example being Chrysler LeBaron 4-doors from the 80's. It had a hatch and 4 doors, but was no wagon. I still say it is a combination of angle of opening, # of doors, and most importantly - intent of design.
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