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PL-11 is a programming language designed for systems and application software. It was introduced in the 1970s as an alternative to COBOL, FORTRAN, ALGOL, Pascal, and other contemporary languages. PL-11 was meant to combine the best features of these languages while maintaining backward compatibility with its predecessor — PL/I (programming language one). While it never gained widespread adoption due to competition from other languages like C and later standards of PL/I itself, it served as an important influence on subsequent developments in programming-language design.