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In summary , eutectic WC-W2C inoculants could provide heterogeneous nucleation sites for grain formation owing to the low wetting angle and the semi-coherent interface with the matrix .
 concept or principle: eutectic; concept or principle: heterogeneous nucleation; concept or principle: grain; concept or principle: interface
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: eutectic, heterogeneous nucleation, grain, interface 
Answer:
 concept or principle: eutectic; concept or principle: heterogeneous nucleation; concept or principle: grain; concept or principle: interface