Undefined (system missing), and valid missing values are all displayed as
NULL in the spreadsheet.
This has been fixed to show the actual missing value or keyword BLANK in
grey or the word "undefined" in light red. You can set a variable to BLANK
(if blank is a valid missing value) by entering a string containing zero or
more blanks and no other character. You cn set a variable to undefined by
pressing the Nullify button or Ctrl+U.
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