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Macros are recorded snippets of interaction with your computer. Generally, each tool comes with its own macro recorder (because only the tool knows how it processes keys). That means, of course, that there is no standard macro syntax, sometimes even between different versions of a product. For years, Microsoft Word and Excel had very different macro syntax even though they were from the same company and in the same Office suite. It wasn’t until Office 2000 that Microsoft finally agreed on a single syntax. Even though a Tower of Babel exists between tools, macros can still help solve very specific problems that you face on a daily basis.
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For any symmetric operation on multiple lines of text, find a pattern and record a macro.