There is an edit button that will let you change or fix posts. We ask that when you make significant changes to a post to indicate what those changes were, either with a summary at the bottom of the message, by changing colors to show added text, by seperating new inserstions from the original by AbE (added by edit) or some similar method. In addition, we ask that any significant changes be made in a timely manner. For example after someone replies to your post it is definitely good form to make sure you clearly note any changes, particularly if they change meanings.
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