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Ciao is an open-source programming language and program development system for logic, constraint, and Constraint Handling Rules (CHR) programming. The language is an extension of Prolog and supports strong type checking, including both static (compile-time) and dynamic (run-time) checks that help prevent errors in programs written using the Ciao dialects of Prolog, CLP(R), CLP(Q), HiLog, and others. Ciao provides modules for defining reusable program components with separate interfaces and implementations to help manage large codebases more easily. It comes with an integrated development environment called CiaoPP that supports automatic generation of documentation from annotated source files.

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