1005
The former represents a rigorous approach , improving the specific stiffness , whereas the latter can be considered as a design approach for weight-reduction in parts that usually have a high safety factor , which has in fact been widely adopted as a common design practice in today 's AM-specific software .
 machanical property: specific stiffness; material: be; material: as; engineering feature: design; engineering feature: safety factor; material: as; engineering feature: design; concept or principle: software
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:
 machanical property: specific stiffness; material: be; material: as; engineering feature: design; engineering feature: safety factor; material: as; engineering feature: design; concept or principle: software