static void callTypeOneSubmenu(){


    System.out.println("Type 1 Operations");
    System.out.println("t1. build a list");
    System.out.println("t2. clear the list");
    System.out.println("t3. check if the list is sorted");
    System.out.println("t4. insert at head");
    System.out.println("t5. insert at tail");
    System.out.println("t6. return to previous menu");
    System.out.println("t7. return to previous menu");
    System.out.println("t8. return to previous menu");

    switch (scnr.nextLine().trim()){
        case "1":
            buildTheList();
            callTypeOneSubmenu();
            break;
        case "2":
            listOne.clearList();
            listOne.printList();
            callTypeOneSubmenu();
            break;
        case "3":
            isListSorted();
            callTypeOneSubmenu();
            break;
        case "4":
            insertAtHead();
            callTypeOneSubmenu();
            break;
        case "5":
            insertAtTail();
            callTypeOneSubmenu();
            break;
        case "6":
            callUpperMenu();
            break;
        case "7":
            callUpperMenu();
            break;
        case "8":
            callUpperMenu();
            break;


    }

}