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MB4 223b: Dimensions of a Mavoi (363:26 - part 3, 27-28)
Using a tzurat hapetach for the fourth side of a mavoi instead of just a lechi or korah. The walls cannot serve as a part of the tzurat hapetach.
A courtyard whose length (the side with walls) is greater than its width (the open side) is treated like a mavoi.
A mavoi narrower than three tefachim.