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For example , increasing the porosity may enhance the biological processes , but it can decrease the stiffness and strength drastically .
 machanical property: porosity; concept or principle: biological processes; machanical property: stiffness; machanical property: strength
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:
 machanical property: porosity; concept or principle: biological processes; machanical property: stiffness; machanical property: strength