((a+b) (a + b) (b + a))* is a regular expression of language with strings of...
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((a+b) (a + b) (b + a))* is a regular expression of language with strings of even lengths O all strings over {a,b} O odd lengths even-even ((a+b) (a + b) (b + a))* is a regular expression of language with strings of even lengths O all strings over {a,b} O odd lengths even-even
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