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Context free languages are closed under-

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1.
The Grammar can be defined as: G=(V, ?, p, S)
In the given definition, what does S represents?
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2.
A regular Grammer is a ___________
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3.
Which of following statement(s) is/are not correct? (I) Languages generated by the grammar S?aSa ? aa is not regular. (II) Languages generated by the grammar S?aSb ? aa is not regular. (III) Languages generated by the grammar S?S1|S3, S1?aS1c |S2|?, S2?aS2b|?, S3?aS3b|S4| ?, S4?bS4c|? is {a^nb^mc^k | k = |n - m|, n?0, m?0, k?0}. (IV) Languages generated by the grammar S?S1S3, S1?aS1c |S2|?, S2?aS2b|?, S3?aS3b|S4| ?, S4?bS4c|? is {a^nb^mc^k | k = |n - m|, n?0, m?0, k?0}.
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4.
Which among the following cannot be accepted by a regular grammar?
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5.
The entity which generate Language is termed as:
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