by sugarRae
You WOULD name him twice going chronologically, because he served separate terms. It would go: Chester A. Arthur, then Grover Cleveland, then Benjamin Harrison, and then you would have to name Grover Cleveland again, because if you said William McKinley, it would not follow chronologically. McKinley didn't serve the term after the Benjamin Harrison, Grover Cleveland did. =P
I can't name all of the presidents in order, but I do know that since Grover Cleveland served non-consecutive terms, he is officially counted as two different presidents. So one would have to name him twice. To only name him once would result in a hole in the chronology.