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This most often results in traditional designs with right angles and flat surfaces due to the simplicity for subtractive manufacturing of such designs .
 engineering feature: designs; concept or principle: surfaces; manufacturing process: subtractive manufacturing; engineering feature: designs
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:
 engineering feature: designs; concept or principle: surfaces; manufacturing process: subtractive manufacturing; engineering feature: designs