1971
4 Residual stress can be minimized by design as mentioned above , and can be further improved by stresB-relief heat treatment a relatively simple recommended solution .
 machanical property: Residual stress; material: be; engineering feature: design; material: as; material: be; manufacturing process: heat treatment; manufacturing process: simple; concept or principle: solution
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:
 machanical property: Residual stress; material: be; engineering feature: design; material: as; material: be; manufacturing process: heat treatment; manufacturing process: simple; concept or principle: solution