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Typical design and application approaches of porous metallic implants normally include the design of scaffold , AM and post-processing as illustrated in 1 .
 engineering feature: design; application: porous metallic implants; engineering feature: design; engineering feature: scaffold; manufacturing process: AM; concept or principle: post-processing; material: as
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; application: porous metallic implants; engineering feature: design; engineering feature: scaffold; manufacturing process: AM; concept or principle: post-processing; material: as