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PL/I (Programming Language One) is a programming language designed for engineering, scientific and business applications. Created in the late 1960s by IBM to provide a single language that could handle all of these tasks, PL/I incorporates elements of earlier languages like COBOL, Fortran, and ALGOL. The language has evolved through several standards which were maintained by industry groups such as ANSI and ISO. Although it was once widely used, PL/I has been largely superseded by more modern languages but remains in use within legacy systems at some large corporations and government agencies.

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