We cycle through displaying the buffers at roughly 12 frames per second- a familiar speed for limited animation- though the drawing itself is processed more responsively. Three frames is something of a sweet spot: using only two frames produces an unpleasant jittering effect, and more than three frames offer a diminishing addition of fluidity:
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One of our macroeconomics courses enrolled 140 undergraduate students, mostly in their first or second year of college, divided across four sections.