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Finally , the youngest known multituberculates do not exemplify patterns of competitive exclusion ; the Oligocene " Ectypodus " is a rather generalistic species , rather than a specialist .
 Oligocene, Ectypodus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oligocene, Ectypodus