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"Don't repeat yourself" (DRY), also known as "duplication is evil", is a principle of software development aimed at reducing repetition of information which is likely to change, replacing it with abstractions that are less likely to change, or using data normalization which avoids redundancy in the first place.
During the early 1990s, Windows grew in popularity, and along with it, Excel, which gradually displaced Lotus from its leading position. A planned total revamp of 1-2-3 for Windows fell apart, and all that the company could manage was a Windows adaptation of their existing spreadsheet with no changes except using a graphical interface.