HELPLIB.HLB  —  COBOL  PROCEDURE_DIVISION, SET  2format UP DOWN
  The SET statement sets values of indexes associated with table
  elements.  It can also change the value of a conditional variable,
  change the status of an external switch, and store the address of a
  COBOL identifier reference at run time.

  Format 2 -

   SET { indx } ... { UP BY   } increm
                    { DOWN BY }
Additional Information: explode extract

indx increm
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