Explanation of Ramban - 19:19 - debate between Rashi vs. Ramban whether there is a reason for the kilayim prohibitions, debate between Ibn Ezra vs. Rambam vs. Ramban what that reason is, discussion of Rashi, Ibn Ezra, Ramban how to translate shatnez, and debate between Rashi vs. Ramban/Tosafos about the details of shatnez