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driving force▼◼◼◼[UK: ˈdraɪ.vɪŋ.fɔːs] [US: ˈdraɪ.vɪŋ.fɔːs]
prime mover [prime movers]▼◼◻◻noun[UK: praɪm ˈmuː.və(r)] [US: ˈpraɪm ˈmuː.vər]
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