4422
Glycerine and nanoparticulate boehmite needles are tested as additives and they successfully improve the printability in the extrusion freeforming process of the paste and compression strength of the green body .
 as, additives, printability, extrusion, process, compression strength, green body
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:
 as, additives, printability, extrusion, process, compression strength, green body