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I'm completely sure picks like "as he walked up to", "he screwed his eyebrows and" or "as far as I know" will happen notoriously but they don't constitute plagiarism because they are very common ex...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7575 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I'm completely sure picks like "as he walked up to", "he screwed his eyebrows and" or "as far as I know" will happen notoriously but they don't constitute plagiarism because they are very common expressions. Don't count conjunctions, pronouns, particles and prepositions in the "five word" count - you'll start getting correct matches, and they will be exceptionally rare. Include these "generic words" and you'll get a ton of false positives. (my experience is with writing variations of "dissociated press" program: find a sequence of words repeating within the same text and cut the text there, continuing from the found match, so that it reads smoothly as a sentence but makes for nonsensical text, a run-on story pieced together from random pieces of a different story in a grammatically correct manner. Finding a repeating sequence of three words within a 130k words document was nearly impossible.)