1979
Due to the complexity of design , design for AM becomes even more crucial to ensure manufacturability and might involve re-design in cases of difficult geometries .
 concept or principle: complexity; engineering feature: design; engineering feature: design; manufacturing process: AM; concept or principle: manufacturability; concept or principle: geometries
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: complexity; engineering feature: design; engineering feature: design; manufacturing process: AM; concept or principle: manufacturability; concept or principle: geometries