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ruleslower=Thread[#-> RotateLeft[#, 13]]&[CharacterRange["a", "z"]];
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rulesupper=Thread[#-> RotateLeft[#, 13]]&[CharacterRange["A", "Z"]];
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rules=Join[ruleslower,rulesupper];
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text="Hello World! Are you there!?"
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text=StringReplace[text,rules]
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text=StringReplace[text,rules]
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