Question 3. (20 points, 7+3 each) Construct a DFA (nondeterminism is not alllowed) for the following sets. The setsa are the same as the previous question. Explain the DFA by writing what each part does or what each state corresponds to (a) L - {wwE a, b}" and w begins and ends with aa or bb (b) L-(wlw {a,b)' and the number of a's in w is divisible by three }