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  • Are all the records the same length? Are there records other than identifier1? Commented Oct 24, 2019 at 16:28
  • all records are the same length. There will be many different identifiers in the file and for each identifier, there may be multiple records. Commented Oct 24, 2019 at 16:33
  • Is each identifier 11 characters long? Or how do we know where an identifier ends? Commented Oct 24, 2019 at 17:10