Eruvin 6a and Eruvin 6b, mostly about breaks in alleyway walls, particularly a mavoi akum, an L-shaped (or U-shaped) mavoi, where the third wall of each segment has a break in it at the corner, and how to treat that. We encounter in that context the idea of bakei bah rabim, if lots of foot traffic goes through an opening, it cannot be considered a break in a wall, it is considered open. We closed with the beginning of the discussion of taking two stringencies of different rabbis, and how that is not considered optimal halakhic behavior.
