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Regarding DfAM studies have shown that gaps between paths due to sharp angle changes can be avoided and as the paths follow the principal stress trajectories , the overall performance can be increased .
 engineering feature: sharp angle; material: be; material: as; machanical property: principal stress; concept or principle: performance; material: be
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: sharp angle; material: be; material: as; machanical property: principal stress; concept or principle: performance; material: be