| http://www.w3.org/ns/prov#value | - In an alternative embodiment shown in FIG. 6, a single side of the frame may be formed of rearrangeable panels as described above, while other sides, such as the sides adjacent to, or the side opposite to, the reconfigurable side, comprises slots, vents, notches or other features which may support the transverse support surface at a variety of heights.
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