Answer: A production of production rule in computer science is a rewrite
rule specifying a symbol substitution that can be recursively performed
to generate new symbol sequences. A finite set of P is the main
component in the specification of a formal grammar (specifically a generative
grammar). The other components are a finite set N of nonterminal
symbols, a finite set (known as an alphabet) Σ of terminal
symbols that is disjoint from N and a distinguished symbol S
€ N that is the start symbol.
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