| http://www.w3.org/ns/prov#value | - Examples are provided, but are not restricted to any of the following: [0440] A blend of gases including argon, carbon dioxide, nitrogen and a quantity of oxygen that does not exceed 5% and is not less than 5 PPM (parts per million). [0441] Air that has been filtered to remove substantially all oxygen therefrom. [0442] Carbon dioxide and nitrogen in any relative proportions. [0443] Carbon dioxide
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