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These general rules address issues on fastener/connector shape , wall thickness , gap width , staircase effect on sloped surfaces , and on the influence of anisotropy on the assembly product mechanical behavior .
 engineering feature: wall thickness; concept or principle: surfaces; machanical property: anisotropy; manufacturing process: assembly; application: mechanical
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: wall thickness; concept or principle: surfaces; machanical property: anisotropy; manufacturing process: assembly; application: mechanical