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This new alloy is maintained in a semi-solid or stress reduced state throughout the build with the assistance of elevated powder bed pre-heating .
 material: alloy; machanical property: stress; process parameter: build; machine or equipment: powder bed
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: alloy, stress, build, powder bed 
Answer:
 material: alloy; machanical property: stress; process parameter: build; machine or equipment: powder bed