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For $$\sum = \left\{a, b\right\}$$ the regular expression $$r = (aa) * (bb) * b$$ denotes
Set of strings with 2 a’s and 2 b’s
Set of strings with 2 a’s 2 b’s followed by b
Set of strings with 2 a’s followed by b’s which is a multiple of 3
Set of strings with even number of a’s followed by odd number of b’s
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