Reference for Chullin 89:6

אלמא כיון דשיעורה מלא מקדח למלא מקדח מצטרפין

that several small holes shall be reckoned together to make up a hole the size of an issar? - He [R'Jeremiah] obviously overlooked the dictum of R'Helbo which he reported in the name of R'Hama B'Guria on the authority of Rab: Holes with loss of substance are reckoned together to make up the measure of a hole the size of an issar, but holes without any loss of substance are reckoned together to make up the greater part [of the circumference].<span class="x" onmousemove="('comment',' And Rab Judah was referring to holes without any loss of substance.');">⁵</span>

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