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Topology optimization , generative design and simulation-driven design tools used to create optimized designs using simulation often create unconventional and complex shapes and forms .
 engineering feature: Topology optimization; enabling technology: generative design; enabling technology: simulation-driven; engineering feature: design; engineering feature: designs; enabling technology: simulation; machanical property: complex shapes
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: Topology optimization; enabling technology: generative design; enabling technology: simulation-driven; engineering feature: design; engineering feature: designs; enabling technology: simulation; machanical property: complex shapes