This free course was written by Elodie Vialleton, with contributions from Kate Fairbairn.
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Figure 3: kupicoo; Getty Images
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Figure 5: falarcompaulo / pixabay
Figure 6: left: Janekvorik; https://commons.m.wikimedia.org/wiki/File:Bo%C3%AEte_aux_lettres_1990.jpg; right: The Carlisle Kid; https://creativecommons.org/licenses/by-sa/2.0/
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