2 mishnayot: First, the question of witnesses of “Kutim” – which usually invalidates a document, with exceptions, of course. Plus, an emendation of the mishnah by the Gemara. Also, documents that are produced in non-Jewish courts are valid – with exception. Plus, “dina de-malkhuta dina” – the law of the land is the law. Plus, speech as speech acts.
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