1870
More importantly , there is no clear relationship between the complexity of the part and the associated production cost , providing more freedom to explore the design space to its full extent .
 concept or principle: complexity; concept or principle: production cost; concept or principle: design space
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: complexity; concept or principle: production cost; concept or principle: design space