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7 Functional material complexity The design process can also consider that to solve some technological problems or to optimise some local properties , some processes allow building up multi-material objects or objects with material gradients .
 concept or principle: Functional material complexity; concept or principle: design process; concept or principle: properties; concept or principle: processes; concept or principle: multi-material; concept or principle: material gradients
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:
 concept or principle: Functional material complexity; concept or principle: design process; concept or principle: properties; concept or principle: processes; concept or principle: multi-material; concept or principle: material gradients