If someone digs out a large cavity in a grain heap leaving no s'chach border, or digs from both sides narrowing the s'chach strip below a handbreadth, is the sukkah valid?
Synopsis
Creating a large hollow without initially leaving a designated space makes the entire sukkah invalid. Digging from multiple sides that reduces the s'chach width below one handbreadth invalidates even the original s'chach because invalid s'chach invalidates within four cubits.
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