| http://www.w3.org/ns/prov#value | - In particular, the invention provides for toy track structures which are molded or extruded of flexible polymeric materials such as low density polyethylene, pl'asticized vinyl chloride, flexible ionomers and copolymers of such materials as ethylene vinyl acetate, polybutadiene styrene and other materials in shapes which are not ordinarily self supporting and in such a condition as to be limp or o
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