Sukkah 6: The Tefach-long Wall

Measurements! Barley. The vine. Fig. Pomegranate. Date. Olive. Also, a sukkah must have 3 walls - though that third wall can be as small as a tefach. This detail is subject to dispute, however. How is it derived? The spelling of "sukkot" is different and each spelling implies a new detail about the sukkot. Plus, the interwoven discussion on "halakhah le-Moshe mi-Sinai." Note the multiple entry points of interpretation, and how that seems to contrast with the halakhah as derived in the context of the Beit HaMikdash.