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<p>Those units just can be applied to elective credit. But most want to use those elective slots to take classes toward a second major, a minor, or just take interesting elective classes. </p>
<p>I know those extra 4 units (or more) may seem to be worth very little but they will put you in a better position for registering for classes. Students register in the order of how many units they have. This can be very helpful in getting the classes you want- if you make sure you register RIGHT at the moment you are able.</p>