168
The 15-mm diameter rod had a layered stop/start flaw , which was also positively identified by all participants .
 diameter, flaw
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 diameter, flaw