| http://www.w3.org/ns/prov#value | - Preferably, the sheet 12 is madeof a flexible plastic material such as a polyvinyl chloride (PVC) or similar material such as film-forming thermoplastics including nylon, polyethylene, polypropylene, polyvinyl acetate, soft cellulose acetate etc.A hollow, oval, and rigid plastic tube 20 having a cross-sectional area just slightly less than the mouth opening 18 extends downward from the mouth openi
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