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SAS Code Fragments
Checking for Duplicate Ids

data ids;
  input id;
cards;
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;
run;

proc sort data=ids out=ids2;
  by id;
run;

data dupes;
  set ids2;
  by id;
  if not (first.id and last.id) then output;
run;

proc print data=dupes;
run;

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