¹                      ²               ³                  ⁴                       ⁵             ⁶               ⁷            ,          ⁸                       ⁹                     ¹⁰                            ¹¹              ¹²              ¹³                     ¹⁴                    ¹⁵                 ¹⁶                    ¹⁷                  ,         ¹⁸                         ¹⁹                  ²⁰              ,                   