| http://www.w3.org/ns/prov#value | - Alternatively, the tray may be in the form of a substantially flat sheet. [0027] Suitable materials from which the tray can be formed include, without limitation, polyvinyl chloride, polyethylene terephthalate, polystyrene, polyolefins such as high density polyethylene or polypropylene, paper pulp, nylon, polyurethane, etc.
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