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   ocr: Successful Mainframe Migrations 4th Generation Programming SAS, CSP Environments 3rd Generation Relational Online COBOL, PLI Database Applications 2nd Generation Dumb Hierarchical Structured Assembler Terminais Database concepts 1st Generation Punch Cards Sequential Machine Code Files Programming Hardwore Data Techniques/ Language Organization Methodologies Figure 1: Successful transitions in the mainframe programming environment.