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MB4 214b: An Enclosed Rechava (359:1); Flimsy Walls (360:1 - part 1)
The status of a חצר (a front yard) of a house vs. a רחבה (a backyard) that is larger than 2 סאה. A enclosed backyard used for non-dwelling purposes.
Using flimsy walls (with either vertical-only or horizontal-only posts) as walls.