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However , traditional petroleum-based support materials are un-sustainable , non-recyclable , and difficult to be completely removed from the target structure after 3D processing .
 material: petroleum-based; concept or principle: materials; concept or principle: un-sustainable; concept or principle: non-recyclable; material: be; concept or principle: structure; concept or principle: 3D processing
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: petroleum-based, materials, un-sustainable, non-recyclable, be, structure, 3D processing 
Answer:
 material: petroleum-based; concept or principle: materials; concept or principle: un-sustainable; concept or principle: non-recyclable; material: be; concept or principle: structure; concept or principle: 3D processing