1940
The combination of additive manufacturing principles and electron beam ( EB ) technology allows complex metal parts , featuring excellent quality material , to be produced , whenever traditional methods are expensive or difficult to apply .
 manufacturing process: additive manufacturing; concept or principle: electron beam; concept or principle: technology; material: metal; concept or principle: quality; material: material; material: be
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: additive manufacturing, electron beam, technology, metal, quality, material, be 
Answer:
 manufacturing process: additive manufacturing; concept or principle: electron beam; concept or principle: technology; material: metal; concept or principle: quality; material: material; material: be