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Even in a highly confined environment , such as the inside of a balloon structure , CNC support material was still easily removed .
 material: as; concept or principle: structure; enabling technology: CNC; material: material
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: as, structure, CNC, material 
Answer:
 material: as; concept or principle: structure; enabling technology: CNC; material: material