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my $sth = $dbh->prepare('SELECT DISTINCT email FROM contacts WHERE gue
+st = ? ORDER BY email'); 
     $sth->execute($value) or die $sth->errstr;

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my $sth = $dbh->prepare('SELECT DISTINCT email FROM contacts WHERE ? =
+ ? ORDER BY email'); 
     $sth->execute($value1,$value2) or die $sth->errstr;