Write a Processing program to create a 600x400 window and then draw horizontal and vertical lines to divide the window into an evenly spaced grid. Your program should rely on a variable n such that each the grid is made up of n vertical and n horizontal rectangles. For example, if n=3, your program should draw four lines to divide the window into nine squares like this. Try your program with a few different values of n.

Note: The project starter will save images of each grid you produce. Please include those images in your submission.