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The driver for this research is the development of multi-material additive manufacturing processes that provide the potential for multi-functional parts to be manufactured in a single operation .
 concept or principle: research; manufacturing process: multi-material additive manufacturing; material: be
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: research, multi-material additive manufacturing, be 
Answer:
 concept or principle: research; manufacturing process: multi-material additive manufacturing; material: be