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interface Counter {
	int getCounter()
	void count()
}
class CounterImpl {
	CounterImpl(int start, int end)
}
Counter <|-- CounterImpl

interface ICounterCounter {
	int getCounter()
	void count()
}
class CounterUpCounter {
	CounterUpCounter(int start, int end)
}
class DownCounter {
	DownCounter(int end, int start)
}
ICounterCounter <|-- UpCounter
Counter <|-- DownCounter