4. For = {a, b}, construct dfa that accept the set consisting of all strings with at least two a's. (points: 3) 5. For = {a, b), construct dfa that accept the set consisting of all strings with at least one b and exactly two a's. (points: 3) 6. Give dfa for the language L = {abnam: n 3, m 2} (points: 3) 7. Give dfa for the language L = {w1abbw2: w1 {a, b}*, w2 {a, b}*} (points: 3) 8. Find dfa for the language on = {a, b}, L = {w: |w| mod 5 = 0} (points: 4)