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Planner is a high-level, declarative programming language for reasoning about problems with incomplete information. It was developed by the Laboratory for Computer Science at the Massachusetts Institute of Technology in 1969. Planner's main innovation was its handling of goal satisfaction through a process called "means-ends analysis." While Planner itself never gained mainstream usage, its concepts significantly influenced later AI planners and languages such as Prolog and OPS5, used in expert systems like CLIPS.

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