Program 19.29 finds the union of two sets. Design a program that finds the difference of two sets. We can have two set differences: first-second and second first. The set first-second contains all...

Program 19.29 finds the union of two sets. Design a program that finds the difference of two sets. We can have two set differences: first-second and second first. The set first-second contains all elements that are in the first but not in the second. The set second-first contains all elements that are in the second but not in the first, as shown below:

Program 19.29