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Various surface-finishing conditions were employed to investigate material removal and surface finish enhancement via synergistic effects in the HCAF process .
 material: material; engineering feature: surface finish; concept or principle: process
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: material, surface finish, process 
Answer:
 material: material; engineering feature: surface finish; concept or principle: process