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 :Re: your message on my talk page, I can quickly reference MOS:CONTRACTION, but I'm not sure how you are defining ""prose"". Generally speaking I try to avoid expanding contractions in things like articles recapping episodes of shows, etc. My understanding of this issue is based on another MOS section indicating that contractions 1) do not sound encyclopedic and 2) are less clear in meaning.  -    
 :: See also MOS:ABBR from which I quote: ""A contraction is an abbreviation of one or more words that has some or all of the middle letters removed but retains the first and final letters (e.g. Mr and aren't). Missing letters are replaced by an apostrophe in multiple-word contractions. Multiple-word contractions should not be used . . . "" (italics mine) -   
 ::: Thank you. The first link was the one I provided. The second was more clear.   "