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This paper presents an introduction to how design rules , such as overhang constraint , large weld bead thickness , and support structure , for mBAAM interact in the context of an excavator arm case study , which was designed using topology optimization .
 concept or principle: design rules; material: as; concept or principle: weld bead; engineering feature: support structure; manufacturing process: mBAAM; machine or equipment: excavator arm; concept or principle: case study; engineering feature: designed; engineering feature: topology optimization
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: design rules, as, weld bead, support structure, mBAAM, excavator arm, case study, designed, topology optimization 
Answer:
 concept or principle: design rules; material: as; concept or principle: weld bead; engineering feature: support structure; manufacturing process: mBAAM; machine or equipment: excavator arm; concept or principle: case study; engineering feature: designed; engineering feature: topology optimization