Hi All,
The PDF for homework 4 was slightly different to the word doc (the previous iteration did not get updated).
It is fine if you used the pdf version. You don't need to change anything; the differences were small. If you did use the old pdf version then please add a note at the top of your submission to that effect for the graders.
The document has now been corrected so fine to use pdf or word document going forward.
Sorry for the inconvenience.
John