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The last Maharsha on Sha"s explains that the reason the statement of "כל השונה הלכות בכל יום וכו" is cited at the end of Niddah (and after quoting the chumra of Rebbi Zeira in Megillah 27b) is because the chumra of Rebbi Zeira made much of hilchos Niddah obsolete. A person might think that, ther...