give me an answer using paper

Design DFA 6. Design the DFA for the following languages: (a) [1 point] L={w{a,b}w does not contuin substring ab}. (b) [1 point] L={w{a,b}w is non-empty and does not contain substring ab\} . (c) [1 point] L={w{a,b}w does not contain substring abab }. (d) [1 point] L={w{a,b}w contains even number of a 's, and one or two b 's }. (e) [1 point ]L={w{a,b}w contains at least two a 's, and one or two b 's }