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The forward extrapolation of the exponential Stk number trendlines also elucidated the reason for the limitations on the width of the powder bed in machines designed by SLM Solutions .
 machine or equipment: powder bed; machine or equipment: machines; engineering feature: designed; 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 bed, machines, designed, SLM 
Answer:
 machine or equipment: powder bed; machine or equipment: machines; engineering feature: designed; manufacturing process: SLM