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It had long been suspected that they reproduced using internal fertilisation , but finding fossilised embryos inside both Materpiscis and in a similar form also from Gogo , Austroptyctodus , proved the deduction was true .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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