When composing documents in OS X, sometimes moving the cursor around with arrow keys is more convenient, and a bit more accurate, than using the mouse.
The arrow keys therefore offer a great advantage both in offering a precise input option (one tap moves over one character, or up one line, etc.), but also in that they are right there on the keyboard. However, if you are unfamiliar with the modifiers you can use with the arrow keys to place your cursor faster, you may resort to pressing and holding them to get the cursor where you want it.
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