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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

The question was posed to me during an online interview.

The above asked question is from CFL- Other Normal Forms in section Properties of Context Free Languages of Automata Theory

1 Answer

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Best answer
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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