(a) Why consider classes E2–E6 in Example 3.5 when the correctness of the program corresponding to tests in these classes can be verified by simple inspection? Offer at least two reasons. (b) Are...

(a) Why consider classes E2–E6 in Example 3.5 when the correctness of the program corresponding to tests in these classes can be verified by simple inspection? Offer at least two reasons. (b) Are there any additional equivalence classes that one ought to consider while partitioning the input domain of wordCount?