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After nitriding and mixing , the powder was characterized in terms of its flow properties and chemical composition .
 manufacturing process: nitriding; concept or principle: mixing; material: powder; concept or principle: properties; concept or principle: chemical composition
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: nitriding, mixing, powder, properties, chemical composition 
Answer:
 manufacturing process: nitriding; concept or principle: mixing; material: powder; concept or principle: properties; concept or principle: chemical composition