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For structural design purposes , the main issues in the realization of Wire-and-Arc Additive Manufactured stainless steel concern inherent geometrical imperfections to be properly characterized and the main material properties , influenced by the orientation of the elements .
 engineering feature: structural design; manufacturing process: Additive Manufactured; material: steel; concept or principle: imperfections; material: be; concept or principle: material properties; concept or principle: orientation; material: elements
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: structural design; manufacturing process: Additive Manufactured; material: steel; concept or principle: imperfections; material: be; concept or principle: material properties; concept or principle: orientation; material: elements