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However , these same attributes pose difficulties for manufacturing and machining of ceramics and ultimately limit the achievable design space of these materials .
 manufacturing process: manufacturing; manufacturing process: machining; material: ceramics; concept or principle: limit; concept or principle: design space; concept or principle: materials
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: manufacturing, machining, ceramics, limit, design space, materials 
Answer:
 manufacturing process: manufacturing; manufacturing process: machining; material: ceramics; concept or principle: limit; concept or principle: design space; concept or principle: materials