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convertHTML("Dolce & Gabbana") should return Dolce & Gabbana.
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convertHTML("Hamburgers < Pizza < Tacos") should return Hamburgers < Pizza < Tacos.
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convertHTML("Sixty > twelve") should return Sixty > twelve.
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convertHTML('Stuff in "quotation marks"') should return Stuff in "quotation marks".
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convertHTML("Schindler's List") should return Schindler's List.
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convertHTML("<>") should return <>.
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convertHTML("abc") should return abc.