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From reading the rules it is obvious that they disapprove of punctuation; but what if your item contains it? For example I have a book titled Hornet's Nest by Patricia Cornwell. If I am sure that the vast majority of people when searching for a book or similar put in the exact title. But if GS does not allow me to use that it would screw up the search results. I certainly would not think of leaving out punctuation or changing the title.