4047
Furthermore , the large size of the experiment motivated the investigation of two different model reduction strategies : exclusion of the powder-bed from the computational domain and simplified scanning strategies .
 concept or principle: experiment; concept or principle: model; concept or principle: computational domain; concept or principle: scanning strategies
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: experiment, model, computational domain, scanning strategies 
Answer:
 concept or principle: experiment; concept or principle: model; concept or principle: computational domain; concept or principle: scanning strategies