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A vs. An: When to Use Indefinite Articles | Merriam-Webster
A/an and the - Grammar - Cambridge Dictionary
"A" vs. "An" - When to Use - Grammar.com
Indefinite Articles: A and An - Grammarly
When To Use “A” vs. When To Use “An” - Thesaurus.com
'A' and 'An': Which Gets Used Where | Merriam-Webster
How to Use Articles (a/an/the) - Purdue OWL® - Purdue University
The indefinite article: 'a' and 'an' - LearnEnglish - British Council
Articles: 'a', 'an', 'the' - LearnEnglish - British Council
When to Use A vs. An | Difference & Example Sentences - Scribbr
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