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This passage really puzzles me:

As a gesture to invoke the Undo command, shaking a handheld device the size of an iPhone is clever and workable. Shaking a much larger device like the iPad is awkward at best

My iPad has an undo button on the keyboard (and even a redo one) and shaking it produces no result. Either our two iPads are different, which I don't think, or that's just a statement that the author did not bother to verify.

Shaking my iPad side to side quite vigorously does bring up an "Undo Typing" dialog box.

I would never do this though - you seem to have to do it pretty quickly, much easier to just hit the "undo" button.

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