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The symbols that occur on the left-hand sides of production rules in a context-free grammar are called non-terminal symbols. The start symbol is often, though not always, denoted by S. This produces the formalism of context-sensitive grammars. An Earley parser is an example of such an algorithm, while the widely used LR and LL parsers are simpler algorithms that deal only with more restrictive subsets of context-free grammars.
