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In this study , processing parameters of the EB-PBF technique such as scanning speed , beam current , focus offset , and number of contours ( one or two ) with the linear melting strategy were investigated .
 concept or principle: parameters; material: as; machine or equipment: beam; concept or principle: offset; engineering feature: contours; manufacturing process: melting
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: parameters, as, beam, offset, contours, melting 
Answer:
 concept or principle: parameters; material: as; machine or equipment: beam; concept or principle: offset; engineering feature: contours; manufacturing process: melting