Are there any nuances that this "across" specifically implies? Does "across" here imply "one after another"? What is the difference between "across the country" and "in the whole country"?
Yes, there is a specific nuance expressed with "across" here. "Across the country" in this context implies that clinics are widespread or scattered out evenly in the country, where as "in the whole country" just expresses a total amount. So "in the whole country" could mean that something is clumped in the same area of the country while "across" indicates that they are evenly distributed. Ex: There are several lights across the room. Ex: There are several lights in the room. In this example, the first sentence indicates that the lights are spread out in the room whereas the second sentence implies that they could be close together in one area.
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