You included a script, broken into overlapping parts. The script has missing parts, for example in lines 9-11, 13-17, 20, etc. Fill in the missing parts, using the information provided in the problem statement. For example, think about equaiton 5 as you complete line 20.
Run the script after you fill in the blanks. If you have overlooked a blank, it will produce and error message, and you fix that line, and try again.
