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MB4 226b: Bent Mavoi (364:3)
A mavoi opened on both ends that is shaped like an L/ד is still considered a מבוי מפולש and needs a צורת הפתח at the corner plus a lechi/korah at each end.
A mavoi opened on both ends that is shaped like a ח needs a צורת הפתח at both bends and a lechi/korah at each end.