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In this work , the selective laser melting ( SLM ) process was used to manufacture MM parts which feature steep material transitions from 316L stainless steel ( SS ) to Ti-6Al-4V ( TiA ) through an interlayer of HOVADUR® K220 copper–alloy ( CuA ) .
 manufacturing process: selective laser melting; manufacturing process: SLM; concept or principle: process; concept or principle: manufacture; engineering feature: feature; material: material; material: 316L stainless steel; material: SS; material: Ti-6Al-4V
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: selective laser melting, SLM, process, manufacture, feature, material, 316L stainless steel, SS, Ti-6Al-4V 
Answer:
 manufacturing process: selective laser melting; manufacturing process: SLM; concept or principle: process; concept or principle: manufacture; engineering feature: feature; material: material; material: 316L stainless steel; material: SS; material: Ti-6Al-4V