1989
Therefore , this is an indirect lightweight design method for AM , which is also called lattice configuration , 18 .
 concept or principle: lightweight; engineering feature: design; manufacturing process: AM; concept or principle: lattice configuration
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: lightweight; engineering feature: design; manufacturing process: AM; concept or principle: lattice configuration