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Review title: MUST BUY NEW
Product review: This is a great book, I recommend it to all.VERY IMPORTANT. You must buy this book new in order to take the online test. I purchased a used book through the marketplace (always and excellent experience by the way) so the code has already been used. Now I have to spend the money to buy a new one just to take the test. In this case buying used does not save you anything.
