1. In this exercise, you will need the itemAt method from the previous programming project. Write a program that prints all strings with at most n letters, where the letters are chosen from a range...

1. In this exercise, you will need the itemAt method from the previous programming project. Write a program that prints all strings with at most
n
letters, where the letters are chosen from a range first ... last of characters. The following is an outline for an algorithm to do this using a stack. Your program should use a stack to implement this algorithm: