1493
The moveable gas nozzle , which supplies argon , nitrogen or CO2 gas , is used to provide active , or forced , cooling on the fabricated part during and/or after deposition of each layer .
 concept or principle: gas; material: argon; material: nitrogen; material: CO2; manufacturing process: cooling; concept or principle: fabricated; concept or principle: deposition; process parameter: layer
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:
 concept or principle: gas; material: argon; material: nitrogen; material: CO2; manufacturing process: cooling; concept or principle: fabricated; concept or principle: deposition; process parameter: layer