1.

The context free grammar for the languageL = {an bm | n = m + 3, n = 0, m = 0} is

A. S ? aaa A; A ? aAb | B, B ? Bb | ?
B. S ? aaaA|?, A ? aAb | B, B ? Bb | ?
C. S ? aaaA | aa A | ?, A ? aAb | B, B ? Bb| ?
D. S ? aaaA | aa A | aA | ?, A ? aAb | B, B ? Bb | ?
Answer» E.


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