(a) (Mishnah): A fetus, a Yavam, engagement, a deaf man, and

a 9-year old disqualify but do not permit to eat;

(b) If we are in doubt if a boy is 9 years old or not; if we

are in doubt if a boy brought 2 hairs or not; if a house

fell on a man and his brother's daughter, and it is not

known who died first - the widow does Chalitzah but not

Yibum.

) Answer #1 (Abaye): The case is, the 9-year old did Yibum.

mid'Oraisa, he acquires her.

1. One would think, since he acquires her mid'Oraisa,

and his relations are considered relations, he

permits her to eat - the Mishnah teaches, this is

not so.

i. Chachamim made relations of a 9-year old Yavam

as a Ma'amar.

2. Objection (Rava): If so, how do we understand the

end of the Mishnah - if we are unsure if he is 9

years old ...

i. If a boy known to be 9 does not permit, we need

not teach a doubtful 9-year old!

(g) Answer #2 (Rava): Rather, the Mishnah says that any man

forbidden to her that disqualifies her by having

relations with her, such a 9-year old also disqualifies

her.

I don't understand rava's objection: even you separate the mishna to 2 parts

and the case of the doubt about the age of the yavam is among the cases that

we demand chalitzah - and not among the cases of permission to eat - so rava

couldn't say that:

If a boy known to be 9 does not permit, we need not teach a doubtful 9-year

old!

Because there is no connection between the things!