RTRTRTRTRTRT                             RTRTRTRTRTRTRTRTRTRTRTRTRT
RT              RT                                          RT
RT              RT                                          RT
RT              RT                                          RT
RT              RT                                          RT
RTRTRTRTRTRTRTR                                          RT
RT   RT                                                     RT
RT     RT                                                   RT
RT       RT                                                 RT
RT          RT                                              RT
RT             RT                                           RT
RT               RT                                         RT
RT                 RT                                       RT
RT                   RT                                     RT