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Significant improvements in surface state were observed after a 10 min treatment , with a 5-fold reduction in roughness .
 concept or principle: surface; concept or principle: reduction; machanical property: roughness
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: surface, reduction, roughness 
Answer:
 concept or principle: surface; concept or principle: reduction; machanical property: roughness