@Test
public void test2DList() {

    List<String> l = Arrays.asList("123", "456", "789", "1011", "abc", "adf", "efa");
    List<List<String>> ll = new ArrayList<>();
    for (int i = 0; i < 10; i += 1) {
        ll.add(l);
    }
    System.out.println(displayList(ll, true));
}