Modify the program in Problem 7 to check that no one receives more than four tickets and that multiple requests from the same person are disallowed.
Problem 7,
A limited number of tickets for the Hoops championship basketball game go on sale tomorrow, and ticket orders are to be filled in the order in which they are received. Write a program that a box-office cashier can use to enter the names and addresses of the persons ordering tickets together with the number of tickets requested, and store this information in a list. The program should then produce a sequence of mailing labels (names, addresses, and number of tickets) for orders that can be filled.