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An efficient DfAM filter for TO , avoiding support structures , has also been the subject of research in the works of Langelaar , in which a projection method was proposed for 2D and 3D cases .
 application: filter; engineering feature: support structures; concept or principle: research; concept or principle: 2D; concept or principle: 3D
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:
 application: filter; engineering feature: support structures; concept or principle: research; concept or principle: 2D; concept or principle: 3D