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A case study is conducted to validate this predictive framework through predicting the porosity of 17-4 PH stainless steel manufacturing on a ProX 100 selective laser melting system .
 concept or principle: case study; concept or principle: framework; machanical property: porosity; material: 17-4 PH stainless steel; manufacturing process: selective laser melting
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: case study, framework, porosity, 17-4 PH stainless steel, selective laser melting 
Answer:
 concept or principle: case study; concept or principle: framework; machanical property: porosity; material: 17-4 PH stainless steel; manufacturing process: selective laser melting