garrulous gastropod - chapter 5 exercise #5 has no published solution

(perhaps others as well - but this is the first that i noticed)

exercise #5 asks the reader to predict the outcome. I think it might be nice to include a short comment in the solutions file explaining what the result actually is. While it is easy to run the code; relying upon that presumes that the reader's code is functioning the same as the authors at that point.
