Assertion: manhole cover | /r/HasProperty | installed inthe past
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Source sentences:
text: Nevertheless, and whatever be the explanation, most, if not all, manhole covers that have been installed inthe past were manufactured with holes in them; the size of the holes varying from less than an inch up to perhaps one and one half inches in diameter and the number varying from one or two up to as many as thirty to forty and in some instances, even more.