So it helps first of all when you're setting up the spreadsheet I suppose you can create one formula then copy it instead of having to edit each one individually, erm but later on you might accidentally or maybe deliberately in some cases overtype a cell and er  if you have to put it back again  and what you probably do is copy it from the adjacent cell and then you have to study the formula to try and understand it, and then edit it if it wasn't the copyable formula and, er it may take a little time to edit it but it could take you a lot longer to understand it.