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Extend the following BNF to an attribute grammer, variable is declared once. 2. Extend the following BNF to an attribute grammar to ensure that a

Extend the following BNF to an attribute grammer, variable is declared once.

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2. Extend the following BNF to an attribute grammar to ensure that a variable is declared once, not multiple times. prog> var-decl> var a | b | >

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