Review the גמרא דף לח. “ב”ה אומרין (two dots – bottom of the Amud) until דף לח: “א”ר זריקא (seven lines from the top of the Amud)
Questions:
What is the chidush of Rav Sheshes and Rav Oshia that Beis Hillel permits חזרה even on Shabbos?
How does Rashi address this? (Breakdown the three components of Rashi)
Learn תוס’ דף לח: “אפילו
Learn תוס’ דף לו: “וב”ה אומרים אף מחזירין
How does Tosfos address this?