| http://www.w3.org/ns/prov#value | - The front wall includes a rigidifying material 36 (e.g., cardboard, plastic sheet, or other sturdy material) disposed between a soft material 38 (e.g., felt, cotton, and so on) that defines an inner surface of the front wall, and a protective material 40 (e.g., leather, vinyl, and so on) that defines an outer surface of the front wall.
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