Since this is a contest for both published and unpublished books, I see that it would leave too many published authors out to maintain a stringent word count. That rule has been changed. There is no exact count needed, but remember that blurbs must fit on the back of a small book, so keep them to an appropriate length. The contest is meant to be educational and rules may be subject to change in keeping with that spirit.
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"Better to write for yourself and have no public than to write for the public and have no self."