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An initial feasibility study shows promising results when using forced interpass cooling with compressed CO2 to fabricate Ti6Al4V thin-walled structures , as shown in 9 .
 concept or principle: feasibility; process parameter: interpass; manufacturing process: cooling; material: CO2; manufacturing process: fabricate; material: as
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: feasibility; process parameter: interpass; manufacturing process: cooling; material: CO2; manufacturing process: fabricate; material: as