noun
A word used to identify any of a class of people, places, or things
conjunction
A word used to connect clauses or sentences or to coordinate words in the same clause
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The collaboration between a and r scientists resulted in groundbreaking research findings.
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I heard that a and r are teaming up for a new project at work.
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Those a and r dudes are always working on something cool together.
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The relationship between a and r is like a well-oiled machine, always in sync.