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   ocr: Products Vendor Data Layers Application Layers Platform PowerPlay CognosCorp. - 2 Tierl Impromptu 67S.BedfordSt. 2 Tier3 Buringtn,MA01803-5164 3 6034-01051612960 ax161/229-9828 LEGEND: Data Layers: Application Layers: Platform: 1=0perational Data 1=Extraction/Tran/Transformation Functions Tier1=Client (PCWorkstation 2=Atomic Warehouse Data 2= Relational DBMS Tier2-Application: Server 3=Summarized, Multidimensional Data 3= Application Logic Tier3-Enterprises Server 4=End-User Functions TABLE 3. Product list (continued from page. 34).