How would you represent a rule in Prolog to determine if there's a direct flight from one city to another at a specific departure time? How would you represent a rule in Prolog to determine if there's a direct flight from one city to another at a specific departure time? flight(X, Y, T) :- direct_flight(X, Y, T). direct_flight(X, Y) :- flight(X, Y, _, _). direct_flight(X, Y, T) :- flight(X, Y, T, _). flight(X, Y) :- direct_flight(X, Y, _, T)