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pop(usa,203). pop(india,548). pop(china,800). pop(brazil,108). area(usa,3). area(india,1). area(china,4). area(brazil,3). density(Country,Density) :- pop(Country,P), area(Country,A), Density is P/A.
pop(usa,203).
pop(india,548).
pop(china,800).
pop(brazil,108).
area(usa,3).
area(india,1).
area(china,4).
area(brazil,3).
density(Country,Density) :-
pop(Country,P),
area(Country,A),
Density is P/A.