The Gemara asks that the Passuk was already applied to determine the size of a Karfef (and is thus unavailable for the rope size).  Tosfos (23b) points to this Gemara as an indication that the Karfef size is a din Torah (otherwise one would be able to derive two hints from the same Pssuk).  How is the din of Karfef – which seems to be a Derabanan concept – have a Torah application?

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