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Accurate modeling of mechanical properties ( e.g. , stiffness , strength ) of hollow microlattices is challenging , primarily due to the complex stress state around the hollow nodes and the existence of manufacturing-induced geometric imperfections ( e.g .
 process characterization: Accurate; concept or principle: mechanical properties; machanical property: stiffness; machanical property: strength; machanical property: stress; concept or principle: imperfections
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Accurate, mechanical properties, stiffness, strength, stress, imperfections 
Answer:
 process characterization: Accurate; concept or principle: mechanical properties; machanical property: stiffness; machanical property: strength; machanical property: stress; concept or principle: imperfections