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Mei put the use of AM to a case study where they produced a highly integrated catalytic burner for auxiliary power units based on PEM-fuel cells .
 manufacturing process: AM; concept or principle: case study; machine or equipment: catalytic burner; machine or equipment: auxiliary power units; machine or equipment: PEM-fuel cells
Please list all entity words in the text that fit the category.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} 
Answer:
 manufacturing process: AM; concept or principle: case study; machine or equipment: catalytic burner; machine or equipment: auxiliary power units; machine or equipment: PEM-fuel cells