1895
However , their efforts are mainly focusing at 2D problems with consideration of only one simple or limited subset of AM constraints , e.g .
 concept or principle: 2D; manufacturing process: simple; manufacturing process: AM
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: 2D; manufacturing process: simple; manufacturing process: AM