The table below shows the closure properties of all the formal languages.
Note :Union , Intersection or difference with regular doesn't change the language. i.e.
Let (AnyLANG) below represents any of the language among DCFl , CFl , CSL , RE or REC
Regular ∩ AnyLANG = AnyLANG
Regular ∪ AnyLANG = AnyLANG
Regular - AnyLANG = AnyLANG
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