1581
Topologically , optimised parts have been created with internal geometry , using a narrow-waited structure that avoids the need for building supports .
 concept or principle: Topologically; engineering feature: internal geometry; concept or principle: structure; application: supports
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: Topologically; engineering feature: internal geometry; concept or principle: structure; application: supports