2031
Hence , the design and simulation focuses more on the form and shape of the surfaces while the mechanical properties and AM constraints are hard to consider due to their extreme complexity .
 engineering feature: design; enabling technology: simulation; concept or principle: surfaces; concept or principle: mechanical properties; manufacturing process: AM; concept or principle: complexity
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; enabling technology: simulation; concept or principle: surfaces; concept or principle: mechanical properties; manufacturing process: AM; concept or principle: complexity