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Obodoagu, Kenneth Ogomegbunam and Cyril, Anamelechi Chiana and Okechukwu, Elizabeth Uzoamaka (2025) EFFECT OF SUSTAINABLE LEAN SIX SIGMA ON OPERATIONAL EFFICIENCY IN SOUTHEAST NIGERIA'S FOOD INDUSTRY. American Research Journal of Economics, Finance and Management, 13 (3). pp. 71-90. ISSN 2836-9416