(a) {banbm n≥ 3, m ≥ 2}. : (b) {w € {a,b}* : every maximal substring of w consisting entirely of symbols a is of length exactly 3}. (c) {wЄ {a,b}* : w does not contain bab as a substring}. (d) {w€ {a,b}* : w begins with bb and nɩ(w) mod 3 = 0}.

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