| http://www.w3.org/ns/prov#value | - A stacked cushion as recited in claim 24, wherein a cross section of each of said first hollow columns taken orthogonal to said first longitudinal axis of said first hollow columns has a shape selected from the group consisting of triangular, square, rectangular, pentagonal, heptagonal, octagonal, round, oval, and n-sided polygonal where n is an integer.
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