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On a roll yes, but forgot to mention the Absolute essentials: COBOL,MVS,VM,VSE,RPG,JCL,CICS,REXX,JCL,CL,VSAM,DB2. Good that you mentioned AS400 though :)
Is that a live requirement? Sadly, I do have experience in all of those, and in all cases my experience started over 20 years ago! :-D
