Rental ::= < List(Neighborhood), List(Bedrooms), List(Price) >
Each HTML page is seen as a list of 3-tuples, where each such tuple consists of three embedded lists: Neighborhoods, Bedrooms, and Prices. Any of the three embedded lists may be present or absent from a particular rental; furthermore, the three lists may appear in any particular order !
Items to be extracted: Neighborhood, Bedrooms, Price.
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