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The principles of how FFF and BAAM operate are similar – polymer feedstocks are heated until molten and then extruded to form three-dimensional parts through layer-by-layer additive manufacturing .
 manufacturing process: FFF; material: polymer feedstocks; manufacturing process: extruded; concept or principle: three-dimensional; concept or principle: layer-by-layer; manufacturing process: additive manufacturing
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: FFF, polymer feedstocks, extruded, three-dimensional, layer-by-layer, additive manufacturing 
Answer:
 manufacturing process: FFF; material: polymer feedstocks; manufacturing process: extruded; concept or principle: three-dimensional; concept or principle: layer-by-layer; manufacturing process: additive manufacturing