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PL/I (Programming Language One) is a high-level programming language designed for scientific, engineering, business, and systems programming. It is an imperative, procedural, and structured language that supports both structured programming and data structuring. PL/I also has features for handling complex data types, such as bit strings, octal and hexadecimal numbers, and packed decimal numbers. PL/I is a very large and complex language, with over 500 built-in functions and operators. Easy PL/I is a subset of PL/I designed for students and beginners. It is a smaller, simpler version of PL/I that is easier to learn and use. Easy PL/I includes all of the features of PL/I except for a few of the more complex features. Easy PL/I is still a very powerful programming language and can be used for scientific, engineering, business, and systems programming.