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==PL/I== [[PL/I]] procedures can be nested, that is, procedure A may contain procedure B, which in turn may contain C. In addition to data declared in B, B can also reference any data declared in A, as long as it doesnβt override the definition. Likewise C can reference data in both A and B. Therefore, PL/I ENTRY variables need to contain ''context'',<ref>{{cite book |last1=Abrahams |first1=Paul |title=The PL/I Programming Language |date=March 1978 |publisher=Courant Mathematics and Computing Laboratory, New York University |pages=22β24 |url=http://www.iron-spring.com/abrahams.pdf |access-date=April 4, 2025}}</ref> to provide procedure C with the addresses of the values of data in B and A at the time C was called.
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