R' Yehudah said: If so, why do we mention the opinions of an individual among the majority for naught? So that if a person will say, “Thus have I received as a tradition,” one will [be able to] answer him, “It is in accordance with the words of So-and-so that you have heard!”

Beis Shammai say: A quarter[-kav] of bones [transmits tumah] from the bones, whether from two or three. But Beis Hillel say: A quarter[-kav] of bones [transmits tumah only when they come] from the [bones of a single] corpse, from a majority of the structure or from a numerical majority. Shammai says: Even from one bone.