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MB4 211b: Other Ways to Halachically Enclose a Large Yard (358:2-4)
If a yard was originally enclosed but not for dwelling purposes one can make it into an area enclosed for dwelling (מוקף לשם דירה) by breaching and fixing the wall. What if that's not possible?
A mound that is 10 tefachim tall has the same status as a קרפף.