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Two functional prototypes were developed with the selected materials from the explained methodology a PLA and a flame retardant ABS , and post processed to full fill the actual product´s specifications .
 concept or principle: functional prototypes; concept or principle: materials; concept or principle: methodology; material: PLA; material: flame retardant; material: ABS; concept or principle: processed; process parameter: specifications
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: functional prototypes, materials, methodology, PLA, flame retardant, ABS, processed, specifications 
Answer:
 concept or principle: functional prototypes; concept or principle: materials; concept or principle: methodology; material: PLA; material: flame retardant; material: ABS; concept or principle: processed; process parameter: specifications