1874
The method uses numerical analysis and design solution update steps in an iterative way , mostly guided by gradient computation or non-gradient discrete approaches .
 engineering feature: design; concept or principle: computation; concept or principle: non-gradient discrete approaches
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; concept or principle: computation; concept or principle: non-gradient discrete approaches