Reference for Chullin 88:4

אמרו ליה רב כהנא ורב אסי לרב

He set about to examine it on the basis of the greater part of the outer circumference; whereupon R'Kahana and R'Assi said: 'But you have taught us, Master, to examine it on the basis of the greater part of the inner circumference!' Rab therefore sent the case to Rabbah B'Bar Hana and he examined it on the basis of the greater part of the inner circumference.

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