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A 98 % argon 2 % CO2 welding gas was used with a flow of 12 l/min.A cradle-to-gate Life Cycle Assessment ( LCA ) was performed .
 material: argon; material: CO2; concept or principle: gas; concept or principle: Life Cycle
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:
 material: argon; material: CO2; concept or principle: gas; concept or principle: Life Cycle