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Ffigur 1: © Marjan Apostolovic/iStockphoto.com
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
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