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However , despite the high demand , most optical materials are difficult to fabricate into desired shapes using state-of-the-art manufacturing technologies .
 process characterization: optical; concept or principle: materials; manufacturing process: fabricate; concept or principle: state-of-the-art; manufacturing process: manufacturing technologies
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: optical, materials, fabricate, state-of-the-art, manufacturing technologies 
Answer:
 process characterization: optical; concept or principle: materials; manufacturing process: fabricate; concept or principle: state-of-the-art; manufacturing process: manufacturing technologies