Lab4 - Pool Balls
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For this lab (which you place in your "labs" repository), all you need to do is
put together the code shown in class to make a set of five balls bounce off of
the walls and each other. The balls can all be the same color, or you can
explore using a random number to set a color. We will talk about how to do that
in class.

The starting point for this project is the demo code provided in the setup
lecture that provided the graphics library we will be using for future lab
projects.