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Optimal process parameters are usually obtained by scanning single vectors and subsequently determining which settings lead to a good compromise between product density and build speed .
 process parameter: Optimal process; concept or principle: scanning; material: lead; machanical property: density; process parameter: build speed
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: Optimal process, scanning, lead, density, build speed 
Answer:
 process parameter: Optimal process; concept or principle: scanning; material: lead; machanical property: density; process parameter: build speed