Greibach Normal Form (GNF) is a specific way of representing context-free grammars in formal language theory. In GNF, each production rule of the grammar has a particular structure that facilitates certain types of parsing. Specifically, a context-free grammar is in Greibach Normal Form if all of its production rules satisfy the following conditions: 1. The left-hand side of each production must consist of a single non-terminal symbol.
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