// Test the equal/not equal operations
// this test should trigger an TYPE ERROR

class Main {
	void main() {
		C1 a;
		C3 d;
		D1 f;
		boolean x,y,z;
		a = new C1();
		d = new C3();
		f = new D1();
		
		y = f == d;
		x = a != f;
	}
}

class C1 {}

class C2 extends C1{}

class C3 extends C2{}

class D1 {}