Very quickly review the “גמרא דף כה: ” ההיא אבוורנקא (four lines from bottom of the amud) until דף כו (two dots) – (do not focus today on the understanding of the three questions that were asked to רבא)
Focus on “רש”י דף כו. “להרע who presents an entirely new explanation in the Gemara from the תשובות הגאונים
Learn תוס’ “ההוא אבוורנקא
What are the differences between how Rashi and the תשובות הגאונים explain
1. Where it was prohibited to carry and why?
2. Where did רב הונא בר חיננא install the posts?
3. How did it permit carrying?
4. Why did רבא remove the posts?
5. Does רב פפא & רב הונא בריה דרב יהושע agree with רבא or argue with him?
6. What did the ריש גלותא mean when he said וחכמים המה להרע ולהיטיב לא ידעו
Why does Rashi favor the explanation of the תשובות הגאונים more than the explanation that he gave?
See תוס’ ר’ פרץ (towards the end)(attached)