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The inclusion of multiple materials in the topology optimization process has the potential to eliminate the narrow , weak , hinge-like sections that are often present in single-material compliant mechanisms .
 material: inclusion; concept or principle: materials; engineering feature: topology optimization process; concept or principle: compliant mechanisms
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:
 material: inclusion; concept or principle: materials; engineering feature: topology optimization process; concept or principle: compliant mechanisms