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Ffigur 2: © Photogal/iStockphoto.com

Ffigur 3: © Andreas Solaro Stringer/Getty Images

Ffigur 4: © Chakrapong Worathat/Dreamstime.comExternal

Ffigur 5: © Tawheed Manzoor yn Flickr https://creativecommons.org/ licenses/ by/ 3.0/ [Tip: daliwch Ctrl a chliciwch dolen i'w agor mewn tab newydd. (Cuddio tip)]

Ffigur 6: © Alina Solovyova/iStockphoto.com