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However , road width and air gap have least impact on the creep rate of FDM processed prototypes .
 concept or principle: impact; machanical property: creep; manufacturing process: FDM; concept or principle: prototypes
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: impact, creep, FDM, prototypes 
Answer:
 concept or principle: impact; machanical property: creep; manufacturing process: FDM; concept or principle: prototypes