| http://www.w3.org/ns/prov#value | - Such pivoting can take place as soon as the cover is pivoted (relative to the upper portion of the respective sidewall 2A) through an angle which suffices to ensure that its flaps 48 can pivot without being interfered with by the upper portions of the respective sidewalls 2C and 2D. [0072] A pivoting of the flaps 48 relative to the respective cover 32 through 180??? or thereabout is desirable when
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