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R2-D2 and C-3PO, droid counterparts.

"I am C-3PO, human-cyborg relations. And this is my counterpart, R2-D2."
―C-3PO introduces himself and R2-D2 to Luke Skywalker[src]

A counterpart was one of a group of two or more droids who had worked together for a long period of time. C-3PO and R2-D2 were a famous pair of droid counterparts.[1]


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