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State and explain advantages & limitations of regular grammar
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  • CFG are easy to write and easy to understand and easy to parse with com-pared to more powerful grammars, but they cant always express what is exactly desired
  • We cant express English in context free grammar (CFG)
  • We cant write CFG for programming languages.
  • CFG are strictly more powerful than RE.

    Any language that can be generated with RE,can be generated by CFG also.

  • CFG is said to be proper if it has-no unreachable :$\forall,N\in V$: $\exists, \alpha. \beta (VUI)^*:S\Longrightarrow \alpha N \beta$

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