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Topology optimisation is a mathematical approach that optimises material layout within a given design space , for a given set of loads and boundary conditions so that the resulting layout meets a prescribed set of performance targets .
 engineering feature: Topology optimisation; concept or principle: mathematical; material: material; concept or principle: layout; concept or principle: design space; application: set; concept or principle: boundary conditions; concept or principle: layout; application: set; concept or principle: performance
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 optimisation; concept or principle: mathematical; material: material; concept or principle: layout; concept or principle: design space; application: set; concept or principle: boundary conditions; concept or principle: layout; application: set; concept or principle: performance