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The Darwinian approach led to the concept of phylogeny ( tree-like structure ) in assembling classification systems , starting with Eichler .
 Darwinian, Eichler
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Darwinian, Eichler