If a mouse enters a checked house carrying a loaf in its mouth and crumbs are found, must the house be rechecked for leaven?
Synopsis
A mouse's nature is not to crumble bread; therefore, crumbs found after a mouse enters are presumed to originate from elsewhere, requiring a new search. A toddler, however, naturally crumbles bread; crumbs found after a toddler's entry do not require a new search.
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