For = {a; b}, construct DFA's that accept the sets consisting of:

(a) Write L in set-builder. Please don't use the notation

(a) all strings with no more than two a's and at least 2 b's

For = {a; b}, construct NFA's and DFA that accept the sets consisting of:

(a) Write L in set-builder. Please don't use something like

(b) all strings do NOT end with two consecutive same symbols (aa or bb)