One might wonder at exactly which point a dying zebra comes to be dead, and one might think there is no definite fact about that. Thus, if a zebra was dying as the 19th century began, there might be no definite fact about how many zebras lived in the 19th century. But it is possible that no zebra was in fact dying precisely in the second when the 19th century began, and no zebra was being conceived in precisely the second the 20th century began. Or we can shift the temporal bounds for the period slightly to ensure this.
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