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This paper presents the methodology and findings of a novel piece of research with the purpose of understanding and mitigating distortion caused by the combined processes of additive manufacturing ( AM ) and post machining to final specifications .
 concept or principle: methodology; concept or principle: research; concept or principle: distortion; concept or principle: processes; manufacturing process: additive manufacturing; manufacturing process: AM; manufacturing process: machining; process parameter: specifications
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: methodology, research, distortion, processes, additive manufacturing, AM, machining, specifications 
Answer:
 concept or principle: methodology; concept or principle: research; concept or principle: distortion; concept or principle: processes; manufacturing process: additive manufacturing; manufacturing process: AM; manufacturing process: machining; process parameter: specifications