4953
Parameters like laser power , spot velocity and thickness of the powder layer are analysed to achieve high density of the parts .
 concept or principle: Parameters; process parameter: laser power; material: powder; process parameter: layer; machanical property: density
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: Parameters, laser power, powder, layer, density 
Answer:
 concept or principle: Parameters; process parameter: laser power; material: powder; process parameter: layer; machanical property: density