9055
However , the AM composites contained porosity ( 15.5 % volume ) , which reduced their mechanical properties in comparison to ECM composites .
 manufacturing process: AM; machanical property: porosity; concept or principle: volume; concept or principle: mechanical properties; manufacturing process: ECM; material: composites
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: AM, porosity, volume, mechanical properties, ECM, composites 
Answer:
 manufacturing process: AM; machanical property: porosity; concept or principle: volume; concept or principle: mechanical properties; manufacturing process: ECM; material: composites