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From a design and structural standpoint , reviews in AM have so far focused on either the development of design rules and frameworks in the context of DfAM or the role of e.g .
 engineering feature: design; manufacturing process: AM; concept or principle: design rules
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:
 engineering feature: design; manufacturing process: AM; concept or principle: design rules