¹                                          ²                                         ³           ,                   ⁴                                 ⁵           ⁶                    ⁷         ,               ⁸                                           ⁹   ,                    ¹⁰                      ¹¹                           ¹²                               ¹³           ¹⁴                            ¹⁵                       ¹⁶                           , '      ' ¹⁷                        ¹⁸                ¹⁹                                ²⁰                                       