import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Arrays;
import java.util.ArrayList;
public class Main {
    //Program start
    
    //Program end

    @Test
public void test1() {
    assertEquals(new ArrayList<>(Arrays.asList(3,4)), intersection(new ArrayList<>(Arrays.asList(new ArrayList<>(Arrays.asList( 3 ,1,2, 4 ,5)),new ArrayList<>(Arrays.asList(1,2, 3 , 4 )),new ArrayList<>(Arrays.asList( 3 , 4 ,5,6))))));
}
@Test
public void test2() {
    assertEquals(new ArrayList<>(), intersection(new ArrayList<>(Arrays.asList(new ArrayList<>(Arrays.asList(1,2,3)),new ArrayList<>(Arrays.asList(4,5,6))))));
}

}