1901
Taking the TO example in 7 , we can easily rotate the 2D result around the X-axis in the 3D and then we will find that there is no need of support structures .
 concept or principle: 2D; concept or principle: 3D; engineering feature: support structures
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: 2D, 3D, support structures 
Answer:
 concept or principle: 2D; concept or principle: 3D; engineering feature: support structures