(a) The language {a^ : n ≥ 0} {ba: n ≥ 1} with at most 4 states. (b) The language {w w either has no consecutive a's or no consecutive b's} with at most 5 states. (c) The language {w w contains an even number of a's or exactly two b's} with at most 6 states. (d) The language {ab, aab, aba}* with at most 4 states.

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