| http://www.w3.org/ns/prov#value | - Although the side apertures b' and c' may be modified to be of various shapes other than the oblong shape, in the preferred embodiment, an shown in FIG. 3, each side aperture is of an oblong shape having a transversely extending major axis and sized such that assuming x is a dimension, i.e. the length of the minor axis, x satisfies the following inequality: y+0.04???x???y+0.14.
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