Referring to exercise 7.5 on page 311 of the book, where one needs to find all nullable symbols, the following points are not clear to me:
1-Removing nullable symbols from CFG G, in the production D --> BB, do we also need to consider the subset that leads to D --> ε and consequently consider D as nullable?
2-If the answer to the previous question is yes, after finding the remaining nullable symbols, do we end up with the ε-production B --> ε again? In this case, do we simply conclude the algorithm by removing ε?"