DuplicateCode.swift

class Vehicle {
    func refuel()
}

class Car: Vehicle {
    func drive()
}

class CleanerCar: Car {
    func cleanVehicle() //DUPLICATE
}

class Motorbike: Vehicle {
    func ride()
}

class Robot {
    func findVehicle()
}

class Mechanic: Robot {
    func maintainVehicle()
}

class Cleaner: Robot {
    func cleanVehicle() //DUPLICATE
}