8237
These factors affected the coordination number of particles in the green part , and caused sintering to progress more slowly in certain areas .
 particles, green part, sintering, areas
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:
 particles, green part, sintering, areas