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Topology Optimization ( TO ) is a freeform computational design methodology which is ideal for designing lightweight structures through a combination of modeling and rigorous optimization .
 engineering feature: Topology Optimization; concept or principle: freeform; engineering feature: design; machine or equipment: lightweight structures; enabling technology: modeling; concept or principle: optimization
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, freeform, design, lightweight structures, modeling, optimization 
Answer:
 engineering feature: Topology Optimization; concept or principle: freeform; engineering feature: design; machine or equipment: lightweight structures; enabling technology: modeling; concept or principle: optimization