1727
This process of stepwise optimization is similar to most evolutionary processes in nature , and removal of material in areas of low stress is a similar optimization strategy as is used in natural systems , hence the motivation to categorize this process as biomimetic .
 concept or principle: process; concept or principle: optimization; concept or principle: processes; material: material; process parameter: areas; machanical property: stress; concept or principle: optimization; material: as; concept or principle: process; 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:
 concept or principle: process; concept or principle: optimization; concept or principle: processes; material: material; process parameter: areas; machanical property: stress; concept or principle: optimization; material: as; concept or principle: process; material: as