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There are other forms of metastable iron carbides that have been identified in tempered steel and in the industrial Fischer-Tropsch process .
 person: Fischer-Tropsch
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: Fischer-Tropsch 
Answer:
 person: Fischer-Tropsch