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The effect of graphene reinforcement and laser power variation was studied on the basis of the porosity , microstructure and mechanical properties of the composite .
 graphene, laser power, porosity, microstructure, mechanical properties, composite
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 graphene, laser power, porosity, microstructure, mechanical properties, composite