The STET text editor (the 'STructured Editing Tool') may have been the first folding editor; its first version was written in 1977 by Mike Cowlishaw. The editor runs on the IBM VM/CMS operating system. STET was written to explore an approach to text editing that followed the principles of Structured programming. It allows programs and documentation to be written 'top-down', with blocks of code or text kept to a limited size (usually less than a page).
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