Reference for Beitzah 5:4

כולהו כרב נחמן לא אמרי כי קושיין כרבה נמי לא אמרי הכנה לית להו

None of these [Rav Yoseif and Rabbi Yitzhak] are according to Rav Nahman because of our problems [earlier]. They also did not speak according to Rabbah, [since] they don't have [the] preparation [principle Rabbah outlined above].

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