I was looking at an exercise with a co-worker, both of us viewing our own copy of the book. We noticed that they aren't identical. How many versions are there of this text, and how can you tell the difference between them?

andrew

Whenever we get low on inventory, we reprint the books. When we do a reprint, we address errata and any other reader feedback. If you look on the copyright page of your book, you should see the reprint version you have based on the list of numbers starting with 10. One of you will likely have a 1 listed last in this list of numbers in your book, and the other book will have the list end with a 2. The 2 means the book is in its second printing. There have only been 2 printings so far. Thank you very much!