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The most important group to be affected by this extinction event were the reef-builders of the great Devonian reef systems .
 location: Devonian
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Devonian 
Answer:
 location: Devonian