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A high degree of porosity is observed spatially near the free surface of the part , where the contour during the build process meets the interior hatch .
 machanical property: porosity; concept or principle: free surface; engineering feature: contour; process parameter: build
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: porosity, free surface, contour, build 
Answer:
 machanical property: porosity; concept or principle: free surface; engineering feature: contour; process parameter: build