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efficiency [efficiencies]▼◼◼◼noun[UK: ɪ.ˈfɪʃn.si] [US: ə.ˈfɪ.ʃən.si]
effectiveness [effectivenesses]▼◼◼◻noun[UK: ɪ.ˈfekt.ɪv.nəs] [US: ɪ.ˈfekt.ɪv.nəs]
specific impulse▼◼◼◼
cost effectiveness▼◼◼◼
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