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During this optimization iteration process , segments of the predefined initial design space are step by step removed so as to arrive at the minimal part volume/mass .
 concept or principle: optimization; concept or principle: process; concept or principle: design space; concept or principle: step; concept or principle: step; 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: optimization; concept or principle: process; concept or principle: design space; concept or principle: step; concept or principle: step; material: as