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1)

(a) Will the Sukah be Kasher if, in a *large* Sukah, one fills in part of a space of three Tefachim in the S'chach, with metal rods?

(b) Why would the Din be different if one did the same thing in a *small* Sukah?

(c) If one filled in part of the space with canes, the Sukah is Kasher, because of the principle of 'Levud'. That is when it is *next to the wall*. Rav Acha and Ravina argue over a space of less than three Tefachim in the *middle* of the Sukah. According to one of them, the leniency in the former case only applies to the *side* of the Sukah, but not to the *middle*.
Why is that?

(d) Ravina (whom we know traditionally to be the one who is lenient whenever he and Rav Acha have a dispute in this way) brings a proof that 'Levud' applies even in the middle of the S'chach (or of a wall) from the Koreh of a Mavoy, where we validate two beams that protrude from the two parallel walls at the entrance of a Mavoy, which stop within three Tefachim of each other - because of 'Levud'. How does Rav Acha refute this proof?

(a) If a room has a Tefach by Tefach skylight, what will be the Din concerning Tum'ah regarding an object that is ...

1. ... directly underneath the skylight, if there is a piece of corpse in the room?
2. ... in the room, if the piece of corpse is directly underneath the skylight?

(b) How will Ravina refute the proof from here that Levud does not apply in the *middle* of a wall or ceiling?

(c) Why is this not a Binyan Av for the entire Torah (that we say 'Ein Levud be'Emtza')?

1. ... a Sukah with Pasul walls - provided there is at least seven by seven Tefachim of Kasher S'chach in the middle?
2. ... a type of small fish called Abruma? What was the problem with these fish?

4)

(a) Similarly, Abaye permitted a type of small fish called Tzachnasa from the River Bav.
Why did we initially think that this is because the River Bav was a swift-flowing river?

(b) And why, in fact, is this not the reason?

(c) What other reason might there be to permit it?

(d) That reason too, we reject on the same basis as we did the first one. What then, *is* the reason for permitting Tzachnasa from the River Bav? What prohibition are we concerned with?

6)

(a) If S'chach is placed on top of a courtyard that is separated from the adjoining passageway (which is more than four Amos wide) by posts that are placed at intervals of less than three Tefachim apart, will the courtyard serve as a Kasher Sukah?

(b) Abaye validates it even if there are no posts.
Why?

(c) What does Rava say?

(d) Why does Abaye concede that by a Sukah that has only two walls and S'chach consisting of planks of less than four Tefachim wide 'Pi Tikrah Yored ve'Sosem' is not applicable?

(a) Rav permits carrying on Shabbos even more than four Amos inside an Achsadra in a field that is not attached to a house.
On what grounds does he permit it, and why does Shmuel disagree?

(b) What do we initially suggest vis-a-vis the Machlokes between Abaye and Rava that we just learned?

(c) We conclude however, that this is not the case. Even Abaye has to agree that only Rav will agree with him, but not Shmuel.
Why can we not establish Shmuel by Shabbos exclusively, but by Sukah, he will agree that 'Pi Tikrah Yored ve'Sosem'?

(d) How does Rava establish that even Rav (who holds by Achsadra be'Bik'ah: 'Pi Tikrah Yored ve'Sosem') will hold like he holds in the case of Sukah?