The rule is quite clear. ), then use "an". Otherwise, use "a".
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SwagCmoSo i was just curious to know whether I can use it in formal English or not.It is best to go by the rules in formal English writing.
SwagCmolikewise, words like universe, unique ,Uranian have some exception to the above mentioned rule.They are not exceptions. They follow the rule. These words do not begin with a vow