How so? [If] a corpse is outside, and its hair is inside, the house becomes tamei. A bone has on it an olive-sized piece of flesh. If part of this bone was brought under the roof of a house, [the contents of the house] become tamei. There are two bones, each of which has on it half an olive’s size piece of flesh. [If] part of [each bone] was brought under the roof of a house, [the contents of the house] become tamei. [If they were] attached by man, [the house] remains tahor, because whatever is attached by man is not considered an [inherent] attachment.