>
> gen check=1 if fup_pdt>`x' | fup_unit=`Y' | fup_qtycoll`x' & fup_unit=`Y' & fup_qtycoll
where x, y, z are some conditions to be met. Then you would list them, i.e.
list fup_pdt fup_unit if check==1
And you'll know they aren't good at all.
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