11/12: clarity

For one of my courses the publisher sent our bookstore 3 different (but on the surface seemingly identical) versions of the textbook.  It hasn't been a huge issue, but at times it's gotten a little frustrating in class when we're not all looking at the same thing.  I've been trying to "work the problem" over the past week, identifying who has which version, how we can tell them apart, and what we can do to fix the situation and ensure it won't happen in the future.  Today I found a quick way to sort it all out and was almost giddy with gladness.