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From the cross section analysis of the gradient structures , glass proportion increased gradually from the metallic matrix composite ( MMC ) , transition phase to ceramic matrix composite ( CMC ) .
 concept or principle: cross section; concept or principle: gradient structures; material: glass; material: metallic matrix composite; material: MMC; concept or principle: transition phase; material: ceramic matrix composite; material: CMC
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: cross section, gradient structures, glass, metallic matrix composite, MMC, transition phase, ceramic matrix composite, CMC 
Answer:
 concept or principle: cross section; concept or principle: gradient structures; material: glass; material: metallic matrix composite; material: MMC; concept or principle: transition phase; material: ceramic matrix composite; material: CMC