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MB4 222b: Dimensions of a Mavoi (363:26 - part 1)
A korah can only be used to permit carrying in a mavoi if the walls are at least 10 tefachim high but not higher than 20 amot. If the walls are 20 amot high a lechi works but a korah would not.
Lowering the korah or raising the ground under the korah.