| http://www.w3.org/ns/prov#value | - ity than the density of the material of the second layer, and rectangular casing means surrounding the first and second layers of each wall, the casing means having zipper means operable to releasably hold the casing means in a tight fitting relation around the first and second layers, the fastening means including a plurality of releasable hook and loop fasteners, the one of said fasteners secure
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