This free course was written by David King.
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Introduction figure: © CreativeCore; Shutterstock.com
Section 2 figure: © MirageC; GettyImages
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Figure 2: © AddyTsl; Shutterstock.com
Figure 3: © patruflo; Shutterstock.com
Figure 4: © MartinPrescott; GettyImages
Section 3.2 figure: © ESB Professional; Shutterstock.com
Section 4 figure: © Daniel Krason; Shutterstock.com
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