cout << "16 17 18 19\n" <<
            "20 21 22 23\n" <<
            "24 25 26 27\n" <<
            "28 29 30 31"   << endl;

            cout << " 8  9 10 11\n" <<
            "12 13 14 15\n" <<
            "24 25 26 27\n" <<
            "28 29 30 31"   << endl;

                cout << " 1  3  5  7\n" <<
            " 9 11 13 15\n" <<
            "17 19 21 23\n" <<
            "25 27 29 31"   << endl;

                cout << " 2  3  6  7\n" <<
            "10 11 14 15\n" <<
            "18 19 22 23\n" <<
            "26 27 30 31"   << endl;

                cout << " 4  5  6  7\n" <<
            "12 13 14 15\n" <<
            "20 21 22 23\n" <<
            "28 29 30 31"   << endl;
          ```