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H. A. G. S. is a lazy way to sign yearbooks. People who can't spell use it to save time and look stupid.
@mike123: H. A. G. S., I'm not even gonna try to spell it.
Sarah wrote H. A. G. S. on my yearbook and I'm still mad.
Emily used H. A. G. S. on 20 yearbooks and still didn't get a good grade.