Write a regular grammar for each of the following languages (for each of them, the alphabet is {a, b}): Strings with at least two b's that end in aa. Strings whose third letter is an a. Strings that do not contain exactly two b's. Strings that either start with an a and have odd length, or start with a b and have even length. Explain in English what language is produced by each of the following grammars: S rightarrow aA|bB A rightarrow aA|bA|a B rightarrow aB|bB|b S rightarrow aS|bS|bT T rightarrow aU|bU U rightarrow a|b