model(); // Output: Car model.
$car->refuel(); // Output: Car is refueled with disel.
$bike = new Bike();
$bike->model(); // Output: Bike model.
$bike->refuel(); // Output: Bike is refueled with petrol.
?>
model(); // Output: Car model.
$car->refuel(); // Output: Car is refueled with disel.
$bike = new Bike();
$bike->model(); // Output: Bike model.
$bike->refuel(); // Output: Bike is refueled with petrol.
?>
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