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+In-class discussion
+
+Discuss the following questions with students around you.
+
+1. The last command line argument (i.e., categories) may contain one or more words, how does our program know how many words are provided in the categories argument?
+
+2. In our program, how do we determine if a business falls into the chosen categories or not?
+3. Is it necessary to store every field of each line into some data structure or some class object?
+4. Is it neceesary to check the categories field of every line?
+
+5. Do we need call a sort function? The std::list container does have a sort member function.
+6. Do we need to implement a destructor for the class we write? Is heap memory a good choice to store the linked list?