12. References
Image 2 courtesy of CLF taken from https://www.flickr.com/photos/clf/8609356496/
Reused under the Creative Commons Attribution 2.0 Generic License
Image 3 courtesy of Juga Paazmaya taken from https://www.flickr.com/photos/paazio/8445174984/
Reused under the Creative Commons Attribution 2.0 Generic License
Image 4 courtesy of Ann W taken from https://www.flickr.com/photos/sojochick/2870155159/
Reused under the Creative Commons Attribution 2.0 Generic License
Image 5 courtesy of Jan Hiroshi Lintvedt taken from
https://www.flickr.com/photos/hiroshi77/7837797008/
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Image 6 courtesy of JoshBerglund19 taken from
https://www.flickr.com/photos/tyrian123/2941411874/
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13. References
Image 7 courtesy of Evan taken from https://www.flickr.com/photos/e-wander/4142953701/
Reused under the Creative Commons Attribution 2.0 Generic License
Image 8 courtesy of Daisuke Tomiyasu taken from
https://www.flickr.com/photos/pictinas/6068855778/
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Image 9 courtesy of Kentaro IEMOTO taken from
https://www.flickr.com/photos/kentaroiemoto/4394948186/
Reused under the Creative Commons Attribution 2.0 Generic License
Image 10 taken by Xin Cen
Image 11 courtesy of T toes taken from https://www.flickr.com/photos/ttoes/4654368274
Reused under the Creative Commons Attribution 2.0 Generic License