20 ¹    , ² "                                ³                               ⁴                    ⁵                            ⁶                          ⁷            ⁸                 ⁹                         ¹⁰                     ¹¹                       ¹²                      ¹³                     ¹⁴                     ¹⁵             ¹⁶                       ¹⁷                                                       ¹⁸                      ¹⁹                         ²⁰                              ²¹                         ²²       ,             ²³                       ²⁴     "                                    ²⁵                                       ²⁶                   ²⁷                                             ' "