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Introduction: © Grigvovan/Shutterstock.com; Section 2.1: © maridav/Bigstockphoto.com; Sections 5 and 6: © Flynt/Bigsstockphoto.com; Section 5.1: © Rawpixel.com/Bigstockphoto.com; Section 8: © Wavebreakmedia/Bigstockphoto.com.
Introduction: Amy Winter: © The Open University 2017.
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