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Criteria not met for early release book, why?

Hi, I tried to order the Early Release version of, "Learning OpenCV", to take advantage of the half price offer. When the code, WKEARRL, was applied I got the message, "You did not meet the criteria for this discount". When selecting other books from the "discount" page there was no problem and the discount was applied. Please let me know why this happened. Thanks.

Lee Rottler,
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