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The study shows , that the addition of copper particles enables the laser direct structuring of polyamide 12 .
 material: copper; enabling technology: laser; material: polyamide 12
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: copper, laser, polyamide 12 
Answer:
 material: copper; enabling technology: laser; material: polyamide 12