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In a context - free grammar, what is the role of production rules? Group of answer choices To specify the order in which symbols appear
In a contextfree grammar, what is the role of production rules?
Group of answer choices
To specify the order in which symbols appear in the input string
To define the transformations and substitutions allowed between nonterminal symbols
To define the symbols that make up the input string
To enforce precedence and associativity
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