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GED® is a registered trademark of the American Council on Education (ACE).  It may not be used or reproduced without the express written permission of ACE or GED Testing Service.  The GED® brand is administered by GED Testing Service LLC under license from the American Council on Education. Steck-Vaughn®, HMH®, and Curious World™ are trademarks or registered trademarks of Houghton Mifflin Harcourt.