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TTCN (Tree and Tabular Combined Notation) is a standardized language for testing communication protocols. The language allows test cases to be defined at different abstraction levels, from high-level behavioral description using tree notation to more detailed tabular representations. TTCN can be used to automate the process of testing protocol implementations in various systems, including telecom networks and internet technologies. TTCN has evolved over time, with the latest version being TTCN-3.

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