Abstractions in a BNF description that can have two or more distinct definitions, representing two or more possible syntactic forms in the language and this is known to be Nonterminal symbols.
Nonterminal symbols are known to be a kind of symbols that one can be able to replaced.
Note that they are often called simply syntactic variables and as such, Abstractions in a BNF description that can have two or more distinct definitions, representing two or more possible syntactic forms in the language and this is known to be Nonterminal symbols.
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