2.1 Derivations. Give a derivation for the string: s; Reveal. Give a derivation for the string {s;} Reveal. Give a (left-most) derivation for the string {s;s;} Reveal. Using recursion in context-free grammars to describe lists of things is a very common pattern, one that you should try to keep in mind both when reading grammars and when writing.. 6.4.2 Context-sensitive grammar. Context-sensitive grammar is an important grammar in formal language theory, in which the left-hand sides and right-hand sides of any production rules may be surrounded by a context of terminal and nonterminal symbols. A formal grammar G = (Σ, V, S, P ), where V is a set of nonterminal symbols, Σ is a set of.

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A context-sensitive grammar (CSG) is a formal grammar in which the left-hand sides and right-hand sides of any production rules may be surrounded by a context of terminal and nonterminal symbols.Context-sensitive grammars are more general than context-free grammars, in the sense that there are languages that can be described by a CSG but not by a context-free grammar.. The take-home message is that purely context-free grammars cannot handle cross-serial dependencies in natural languages - although examples of this are few and far between. This result has been used to argue that natural languages are properly described by mildly context-sensitive languages.