5200
Therefore , lightweight is paramount.Here , a lightweight electromagnetic actuator for HHBs is conceived using Design for Additive Manufacturing ( DfAM ) tools , including topology optimization and free-shape design .
 lightweight, lightweight, actuator, Design for Additive Manufacturing, tools, topology optimization, design
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 lightweight, lightweight, actuator, Design for Additive Manufacturing, tools, topology optimization, design