1038
As part of an iterative process , in methods utilizing density as a design variable , Finite Element Analysis , sensitivity analysis , regularizations and optimisation steps are repeated in this order until convergence is achieved .
 material: As; concept or principle: process; machanical property: density; material: as; engineering feature: design; concept or principle: Finite Element Analysis; concept or principle: sensitivity analysis; concept or principle: regularizations
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:
 material: As; concept or principle: process; machanical property: density; material: as; engineering feature: design; concept or principle: Finite Element Analysis; concept or principle: sensitivity analysis; concept or principle: regularizations