| http://www.w3.org/ns/prov#value | - Corner insert 21 is formed as one piece from any suitable material such as acrylonitrile butadiene styrene (ABS), polycarbonate or impact modified styrene and includes first and second web portions 41 and 42 which extend in planes at substantially right angles to each other and have a length and a width as shown in FIG. 1 with respect to first web portion 41.
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