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The results indicate that hybrid manufacturing becomes beneficial from an environmental point of view compared to milling , when the material removal ratio exceeds 55 % .
 concept or principle: hybrid manufacturing; manufacturing process: milling; material: material
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: hybrid manufacturing; manufacturing process: milling; material: material