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The weakest part of the FGM structure occurred at the interface between transition phase and the CMC , which was also the interface between the ductile and brittle phases .
 manufacturing process: FGM; concept or principle: interface; concept or principle: transition phase; material: CMC; concept or principle: interface; machanical property: ductile; machanical property: brittle
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: FGM, interface, transition phase, CMC, interface, ductile, brittle 
Answer:
 manufacturing process: FGM; concept or principle: interface; concept or principle: transition phase; material: CMC; concept or principle: interface; machanical property: ductile; machanical property: brittle