| http://www.w3.org/ns/prov#value | - A method according to claim 10, wherein the stream of plastic bottles is a mixture of types of plastic bottles selected from the group consisting of clear polyethylene terephthalate bottles and green polyethylene terephthalate bottles, and wherein the step of selectively removing individual bottles from the stream comprises removing any green polyethylene terephthalate bottles so that any clear po
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