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Topology optimization ( TO ) is a powerful design method which can complement AM by automating the design process .
 engineering feature: Topology optimization; engineering feature: design; manufacturing process: AM; concept or principle: design process
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: Topology optimization, design, AM, design process 
Answer:
 engineering feature: Topology optimization; engineering feature: design; manufacturing process: AM; concept or principle: design process