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When it is difficult to deposit a material A on a material B , it is possible to create a Functionally Graded Material ( FGM ) using a buffer material between them to avoid the appearance of defects .
 material: material; material: material; material: B; material: Functionally Graded Material; manufacturing process: FGM; concept or principle: buffer; concept or principle: defects
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: material, material, B, Functionally Graded Material, FGM, buffer, defects 
Answer:
 material: material; material: material; material: B; material: Functionally Graded Material; manufacturing process: FGM; concept or principle: buffer; concept or principle: defects