Do the additional posts from the NEAS dedicated to certain topics in each module (as an example, Corpfin, Mod 3: Growth Stocks and Income Stocks), which frequently feature Jacob/Rachel dialogue, introduce topics in addition to those covered in the textbook readings, or is the purpose of these posts simply for clarification and more illustrative examples related to the textbook readings?  In other words, do the textbook readings alone contain the material necessary for completion of this course.

[NEAS: These dialogues are clarification; the textbook has all the material needed. Some topics are not easy, and the dialogues may help you.]