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Which of the following can generate Unrestricted grammars?

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Which of the following can generate Unrestricted grammars?

(a) Pentonnen Normal form

(b) Floyd Normal form

(c) Greibach Normal form

(d) None of the mentioned
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Correct choice is (a) Pentonnen Normal form

For explanation: Pentonnen Normal form(for Unrestricted grammars) is a special case where there is a slight modification in the format of Kuroda Normal form.

AB->AD

A->BC

A->a
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