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It should be noted that as good as they are, none of these search tools incorporate their own OCR (Optical Character Recognition) functions. When searching in formats like PDF, they can't "read' words that exist only as pictures, the most common contents of PDFs made by scanning printed materials, nor can they "read" words that are actually vector art (e.g. "text" in files saved from Illustrator, et. al., after the text has been converted to outlines/paths.
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