Good point. Using a proper noun as an indicator for the sentence to check might be more effective.
They key is trying to be able to get to the start of the contents of the book and get past the table of contents, copyright etc....
You mentioned the set of proper nouns are you thinking of doing a lookup with a list of proper nouns found in the beginning of the book? I think using that to identify a sentence might work well but if we just used the nouns without the sentence we would probably get confused with multiple books in a series about the same characters (nouns).
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