| http://www.w3.org/ns/prov#value | - The cover 33 includes a front side piece 33 a, a rear side piece 33 c spaced apart from the front side piece 33 a and opposed to the front side piece 33 a, a peripheral piece 33 b disposed between the front side piece 33 a and the rear side piece 33 c, extending along peripheral edges of the front side and rear side pieces 33 a, 33 c except lower edges of the front side and rear side pieces 33 a,
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