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The printed samples made of PA12 alone possessed quite a high level of porosity ( 4.7 % ) , of which the size of the biggest pore was hundreds of microns .
 concept or principle: samples; material: PA12; machanical property: porosity; machanical property: pore
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: samples, PA12, porosity, pore 
Answer:
 concept or principle: samples; material: PA12; machanical property: porosity; machanical property: pore