2.5.2.5 DELETE Command
  The DELETE command removes a specified line or lines
  from the source program currently in memory. If you sepa-
  rate line numbers with commas, VAX BASIC deletes only the
  specified program lines. If you separate line numbers with a
  hyphen ( - ), VAX BASIC deletes the specified program lines
  and all program lines between them. For example:

  DELETE 10 Removes line 10 from the program
  DELETE 50, 100 Removes lines 50 and 100 from the program
  DELETE 50, 100-190 Removes line 50 and lines 100 to 190 from the
                              program

  If you do not specify a line number, the DELETE command
  is ignored.