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Excerpted from Princeton Review GRE Prep, 2021 by the Staff of The Princeton Review. Copyright © 2020 by TPR Education IP Holdings, LLC. All rights reserved. Excerpted by permission of Penguin Random House LLC, New York, and in Canada by Random House of Canada, a division of Penguin Random House Ltd., Toronto. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.