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Another emerging topic for AM within topologically optimized and variable-density lattices , which will not be further discussed , are both multi-scale and multi-material structures .
 manufacturing process: AM; concept or principle: topologically; concept or principle: lattices; material: be; engineering feature: multi-material structures
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:
 manufacturing process: AM; concept or principle: topologically; concept or principle: lattices; material: be; engineering feature: multi-material structures