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GET FILE='C:\\Program Files\\SPSS\\1991 U.S. General Social Survey.sav'.
SELECT IF $CASENUM = 1.
FLIP.
SORT CASES BY CASE_LBL.
FLIP.
ADD FILES FILE * / IN=REORD
        / FILE='C:\\Program Files\\SPSS\\1991 U.S. General Social Survey.sav'.
SELECT IF NOT REORD.
MATCH FILES FILE * / DROP REORD CASE_LBL .
EXE.