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This process of simulation and material-removal or addition is repeated iteratively until an optimization goal is achieved , and this iterative process may be seen analogous to the process of evolution .
 concept or principle: process; enabling technology: simulation; concept or principle: optimization; concept or principle: process; material: be; concept or principle: process; concept or principle: evolution
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; enabling technology: simulation; concept or principle: optimization; concept or principle: process; material: be; concept or principle: process; concept or principle: evolution