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This is a matter of crucial importance as powders suitable for LS are very expensive , and the powder left after a building episode has to be re-used .
 material: as; material: powder; material: be
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: as, powder, be 
Answer:
 material: as; material: powder; material: be