1986
Certainly , generative design is not only used for topology optimization but also can be applied to form synthesis , lattice and surface structure optimization and trabecular structures as a way to explore more design freedom using AM .
 enabling technology: generative design; engineering feature: topology optimization; material: be; concept or principle: lattice; engineering feature: surface structure; concept or principle: optimization; engineering feature: trabecular structures; material: as; concept or principle: design freedom; manufacturing process: AM
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:
 enabling technology: generative design; engineering feature: topology optimization; material: be; concept or principle: lattice; engineering feature: surface structure; concept or principle: optimization; engineering feature: trabecular structures; material: as; concept or principle: design freedom; manufacturing process: AM