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The surface cleanliness of eleven AM materials , three metals and eight polymers , was tested .
 concept or principle: surface; material: AM materials; material: metals; material: polymers
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: surface, AM materials, metals, polymers 
Answer:
 concept or principle: surface; material: AM materials; material: metals; material: polymers