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There isn't a choice to edit a post with or without the "last edited by..." thing. I think this is how it works: if a post has been read by someone, and it is then edited, the "last edited by..." line is posted. If a post is edited before anyone reads it, the "last edited by..." line is not posted. But don't quote me on this - it's just an observation, and I have no idea if this is true or not.
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