Here's a program you can run, to try to understand why:
data two;
set one;
by x y;
f_x = first.x;
f_y = first.y;
l_x = last.x;
l_y = last.y;
run;
proc print data=two;
run;
How many combinations of X and Y in your data are duplicated?
Or do you find it easier to identify X an Y combinations that are unique?
How do they compare to the X Y combination that did not appear in the output?
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Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.