6661
This has been attributed to the modification of powder surface by removing a moisture skin during the drying process , which prevents the formation of deleterious oxide and hydroxide during SLM .
 material: powder; manufacturing process: drying; material: oxide; material: hydroxide; manufacturing process: SLM
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: powder, drying, oxide, hydroxide, SLM 
Answer:
 material: powder; manufacturing process: drying; material: oxide; material: hydroxide; manufacturing process: SLM