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a language of finite words only. Then K can be concatenated on the left, and only on the left, to L to yield the new ?-language KL.; Omega (infinite iteration) : As the notation hints, the operation is the infinite version of the Kleene star operator on finite-length languages. Given a formal language L, L^? is the ?-language of all infinite sequences of words from L; in the functional view, of all functions .; Prefixes : Let w be an ?-word. Then the formal language Pref(w) contains every finite

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