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Among powder bed fusion technologies , one of the main branches of AM , selective laser sintering ( SLS ) is the second oldest one .
 manufacturing process: powder bed fusion; manufacturing process: AM; manufacturing process: selective laser sintering; manufacturing process: SLS
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 bed fusion, AM, selective laser sintering, SLS 
Answer:
 manufacturing process: powder bed fusion; manufacturing process: AM; manufacturing process: selective laser sintering; manufacturing process: SLS