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Code code:"if (foo != bar)"
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Questions about formal grammars, generative descriptions of formal languages.

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Provide "regular" grammar for this language {${a^ib^j \mid i>0\ and \hspace{2.5mm}i\leq j \l... [duplicate]

I'm trying to understand the approach to constructing an grammar which accepts the language ${a^ib^j \mid i>0\ and \hspace{2.5mm}i\leq j \leq(2*i)}$ } Thanks.
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