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1)

(a) We have just established that one may arrange a Mechitzah consisting of people on Shabbos.
Then how do we initially explain the Beraisa which forbids putting up a Mechitzah of people, animals or vessels on Shabbos, or to stand up a bed and drape a sheet over it to protect a corpse or food, from the rays of the sun?

(b) What does the Beraisa say that supports this answer? Which topic is the Beraisa discussing?

(c) On what grounds does the Gamara reject this explanation?

(a) We then attempt to establish the Beraisa which permits placing a person as a wall, according to Rebbi Meir (who speaks about using an animal as the wall of a Sucah).
What does Rebbi Meir say, and how does this explain the Beraisa in question?

(b) This answer too, the Gemara refutes for *two* reasons: one of them, because Rebbi Meir restricts his view to animals, but not to people.
Why the difference?

(c) What is the second problem the Gemara has with the above answer?

(a) The Gemara ultimately establishes both of the above Beraisos like the Rabbanan of Rebbi Eliezer.
Why then, does the one Beraisa permit putting up a wall of vessels, and the other one, forbid it?

(b) What is the proof for this from the Lashon of 'Nafal Dofnah' used by the Tana of the Beraisa (with regard to the wall of a Sucah) which forbids it?

(a) How do we reconcile the Beraisa which permits making a wall of people to enable one to eat, drink and sleep in one's Sucah, with the Beraisa which forbids it?

(b) How do we explain Rav Chisda, who, above, in the episode with Rav Nachman, certainly knew that he was being placed there to help form a wall?

(c) Why can we not answer the discrepancy in a. like we answered the discrepancy with regard to vessels; namely, by establishing the Beraisa which permits it, by the *fourth* wall?

5)

(a) Why did Shmuel give lashes to those men who served as a Mechitzah, to enable water to be brought in from the street?

(b) Rava forbade his Shamash to make use of the Mechitzos of people?
What happened there, and why did he forbid it?

(a) What will be the Din of someone who left his Techum legally, only to discover that his journey was unnecessary? What distance is he permittted to travel from where he is?

(b) What might be meant by 'legally', other than for a D'var Mitzvah (such as to testify that he had seen the new moon).

(a) According to Rabah, what does the Tana mean when he writes 'Im Hayah be'Soch ha'Techum, Ke'ilu Lo Yatza'?

(b) What is the Chidush?

(c) How does Rav Shimi bar Chiya explain the Mishnah?

(d) Why does Rabah not want to learn like Rav Shimi bar Chiya?

(a) According to Rashi's second explanation (with which he himself is not happy), both Rabah and Rav Shimi bar Chiya speak when he has already left his Techum.
What then is their Machlokes?

(b) What did Abaye ask Rabah from someone who acquired his residence in a cave of four thousand Amos, whose roof was less than three thousand Amos, and which had two entrances (like most caves did), one at either end of the roof?

(c) What did Rabah answer him?

(a) How does Abaye eventually prove Rabah wrong from Rebbi Eliezer, who (in a Mishnah later in the Masechta) permits someone who left his Techum on Shabbos to return, provided he is not more than two Amos outside the Techum?

(b) Why can Rabah not answer that *that* is Rebbi Eliezer's opinion, but the Rabbanan disagree?