Reference for Bekhorot 45:3

מה טעם

And 'Ulla further explained: What is the reason?<span class="x" onmousemove="('comment',' Why do we not regard the rest as genuine hullin according to R. Eliezer, since he holds that the se'ah which he separates is the terumah and therefore the rest should be real hullin?');">²</span>

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