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   ocr: au STORE REGION DISTRICT STORE store ID Reton ID DistrictID Store: ID Store Desc: Resion Desc: Dstict Desc Store Desc: District ID Region ID Dstricc) ID District Desc Region ID Rcgion Dese. GEOGRAPHY Repion ID: Dstrictl t Store D Geography ID Regon Desc Dstrict Desc Store Dese scograply Desc Region: D District ID Stere: ID Region Desc: Districr Desc Store Desc Region ID District ID: Regiort Desc District Dese Region D Region Desc Level Code: IGURE 2 The four alternatives for physical representation ofa di- mensional model: (a) flattened, (b) normalized, (c) expanded, and (d) levelized.