1919
In this way , unprintable geometries are excluded from the design space , resulting in fully self-supporting optimized designs .
 concept or principle: geometries; concept or principle: design space; engineering feature: self-supporting; engineering feature: designs
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: geometries; concept or principle: design space; engineering feature: self-supporting; engineering feature: designs