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20.11.11 - Hydrogen, argon, rare gases, nitrogen and oxygen
20.11.11.20 - Argon
20.11.11.30 - Rare gases (excluding argon)
20.11.11.50 - Hydrogen
20.11.11.60 - Nitrogen
20.11.11.70 - Oxygen
Hydrogen, argon, rare gases, nitrogen and oxygen
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