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WFF 'N PROOF is a logic-based game created by the American mathematician and philosopher Raymond Smullyan. The game's title stands for "Well-Formed Formulae and Proof." It is designed to teach and explore concepts in formal logic and the structure of mathematical proofs. In WFF 'N PROOF, players deal with well-formed formulas (WFFs), which are specific sequences of symbols that conform to the rules of a logical language.

A **well-formed formula** (often abbreviated as WFF) is a string of symbols that is formulated according to the rules of a formal language, ensuring that it is syntactically correct. In the context of logic, particularly in propositional and first-order logic, a well-formed formula is a meaningful expression that can be evaluated as either true or false. ### Characteristics of Well-formed Formulas 1.

The Wirth–Weber precedence relationship is a concept in the field of software engineering and project management, particularly concerning the organization of tasks in software development. It is used to define dependencies between tasks and the order in which they should be executed. This precedence relationship identifies which tasks must be completed before others can begin, ensuring that dependencies are respected throughout the development process. For example, if Task A must be completed before Task B can start, then Task A has a precedence over Task B.