DUPOUT=option

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The following data set contains duplicate observations for Patients (PT:- 01 & 02) :
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PT NO
01 12
01 3
01 56
02 2
02 12
03 12
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How does the dupout option work on this data?????
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proc sort data = test out = dedup
-------------------------dupout = dups nodupkey;
--by pt;
run;

It works in a similar manner to nodupkey. Here the "duplicates are detected by the nodupkey option" & are directed into an output dataset with DUPOUT!

The dedup is an output data set that contains only the original observations.
PT NO
01 12
02 2
03 12
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Where as the dups is an output data set that contains all duplicate observations.
PT NO
01 3
01 56
02 12
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