993
A framework , highlighting both the interdependencies between these two central aspects in AM and the necessity for a holistic approach to structural optimization , using lightweight strategies such as topology optimization and/or latticing , was established to summarize the reviewed content .
 concept or principle: framework; manufacturing process: AM; concept or principle: structural optimization; concept or principle: lightweight; material: as; concept or principle: optimization
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: framework; manufacturing process: AM; concept or principle: structural optimization; concept or principle: lightweight; material: as; concept or principle: optimization