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The paper presents selected results of a wide experimental campaign focused on the assessment of the main geometrical and mechanical properties of Wire-and-Arc Additive Manufactured ( WAAM ) stainless steel material , carried out at the Topography and Structural Engineering Labs of University of Bologna .
 concept or principle: experimental; concept or principle: mechanical properties; manufacturing process: Additive Manufactured; manufacturing process: WAAM; material: stainless steel; material: material; process characterization: Topography; concept or principle: Structural Engineering
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:
 concept or principle: experimental; concept or principle: mechanical properties; manufacturing process: Additive Manufactured; manufacturing process: WAAM; material: stainless steel; material: material; process characterization: Topography; concept or principle: Structural Engineering