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Summary

Rabbah: One is allowed to carry within a two walled kosher sukkah on Shabbos based on the principle of “migo” - since the tefach creates a third wall for sukkos, it is also considered a walled-in area with regard to Shabbos.

Abayye challenged him [‘Do we say migo from one halacha to the other?”] from a beraisa: “Sukkah walls are like Shabbos walls [There’s lavud and a picket fence is considered a wall as long there is less than 3 tefachim between the pickets]. Shabbos has a limitation that sukkah does not: A Shabbos wall must have more area of standing wall than open area.” It would seem that this limitation also applies to Shabbos during sukkos so we see that we do not follow the principle of migo!

Resolution: The limitation is only for Shabbos during the year. On sukkos, since it’s a valid wall for sukkah it’s valid for Shabbos as well.