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We develop a Gaussian procesB-based predictive model for the learning and prediction of the porosity in metallic parts produced using selective laser melting ( SLM – a laser-based AM process ) .
 concept or principle: Gaussian; concept or principle: predictive model; concept or principle: prediction; machanical property: porosity; machine or equipment: metallic parts; manufacturing process: selective laser melting; manufacturing process: SLM; manufacturing process: AM 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: Gaussian, predictive model, prediction, porosity, metallic parts, selective laser melting, SLM, AM process 
Answer:
 concept or principle: Gaussian; concept or principle: predictive model; concept or principle: prediction; machanical property: porosity; machine or equipment: metallic parts; manufacturing process: selective laser melting; manufacturing process: SLM; manufacturing process: AM process