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We examined the robustness of diversification patterns in the avian genus Forpus by testing whether the use of different units of biodiversity ( i . e . biological species and statistically inferred species ) impacted diversification rates and inferences regarding important biogeographic breaks in the genus .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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