Question: Let A = {a, b}. Find a regular expression r such that the language L_r consists of all words w where: w begins with a^2

Let A = {a, b}. Find a regular expression r such that the language L_r consists of all words w where: w begins with a^2 and ends with b^2 w contains an even number of a's Consider the grammar S rightarrow aS | aSbS | epsilon This grammar is ambiguous. Show in particular that the string aab has two: Parse trees Leftmost derivations Rightmost derivations Find an unambiguous grammar for this language

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