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MB4 218a: Spaces in a Mechitza (362:8-10)
If the breached part of a mechitza is greater than the wall the mechitza is not valid unless each space is less than 3 tefachim (lavud).
What if there are three good walls and 1 wall with more open space than actual wall (פרוץ מרובה על העומד)? What if there is more wall but it's noncontinuous?