Look what I found among my high-school notebooks, still in pencil! I remember working on this during math class and drama rehearsals. Most of the articulation markings are not in the manuscript (right, as if this is a historical Urtext edition!) but they are required because of Sib's limited playback capabilities. It should give you a better understanding of how it should be played. Do what you like with the groups of sixteenths in terms of articulation; I play it differently every time.