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- lEqualToTime(_, _, 0). % stopping state
- lEqualToTime(StationA, StationB, Time) :-
- overground(StationA, StationB, Time);
- overground(StationB, StationA, Time);
- NewTime is Time - 1, % decrement Time value each subsequent call
- lEqualToTime(StationA, StationB, NewTime). % recurse
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