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doer, performer▼noun
operator [operators]▼noun[UK: ˈɒ.pə.reɪ.tə(r)] [US: ˈɑː.pə.ˌre.tər]
worker [workers]▼noun[UK: ˈwɜːk.ə(r)] [US: ˈwɝː.kər]
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