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Grap is a text processing language and mathematical formatting tool for producing technical documents. It uses graphical operators to create diagrams that can be integrated into the output document. Part of Unix's groff package, it works in conjunction with a preprocessor like tbl for tables and eqn for equations. This approach simplifies typesetting complex documents by allowing users to express relationships between elements visually using compact notation. Grap has similarities to other graphing languages such as Dot and GNU pic, but is more focused on functional block diagrams than general-purpose graph visualization like Dot or low-level graphics like pic.

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