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QUALITY CONTROL OF SANDAL OUTSOLE USING SIX SIGMA METHOD AND FAILURE MODE AND EFFECT ANALYSIS (FMEA). IJEIRC [Internet]. 2025 Aug. 31 [cited 2026 Apr. 22];2(8):56-69. Available from: https://e-journal.antispublisher.id/index.php/IJEIRC/article/view/392